None, this marker uses a redesigned system originally used by the old E-Mags, which are very seldom seen anymore
Main- X7 Phenom, stock
Secondary- Smart Parts Ion
Stiffi barrel 16"
68/4500 carbon fiber Pure Energy tank
Techt Fang trigger
Shocktech Superfly bolt
Collapsible CAR stock
Python compression system
Smart Parts Progressive 16"
Good barrel kit
-Sturdiness- Despite being an electropneumatic, it definitely has the durability of a Tippmann. I belly crawled on somewhat soggy ground for about 50+ feet and had no issues with the electronics.
-Ability to switch from electro to manual- This one speaks for itself. Due to this and the cyclone's manual rod, you can keep playing even if both the electonics and the cyclone feed fail.
-Accuracy/Consistency- Out of the box it was shooting 270 at around +/- 7, and I was able to hit targets within a 3" circle from 30' away, even on full auto. In this test firing I broke two balls, but I attribute this entirely to cold paint. While I was loading my hopper, one of the paintballs fell two feet to the ground and split right in half; I never had any problems with chops during the day. I ran it off c02, with bad paint (in a different test firing), and was still almost as accurate as before. I also want to mention that this was the performance right out of the box, and this marker comes ready to play, without needing a bunch of startup adjustment and fiddling to make it work well. However, it will not (obviously) go full auto off c02. Instead of firing three times then going to full auto, it will not shoot after the second shot, forcing you to pause for a second. If you must use c02, you're better off using it in mechanical mode.
Weight- This is a lot lighter than other Tippmanns. This is by no means a high end, so it weighs 4lbs unloaded. Still, that's much better than most tippmanns, and if you use a remote line and load it, it's similar to a loaded high end and with a tank attached. The weight actually stabilizes the marker and absorbs what little recoil there is.
-Ease of dissassembly- The Phenom is a breeze to dissassemble. Push a few pins, and the entire grip comes off, as well as the internal mechanism. I also want to mention that changing batteries is so much easier with the Phenom. Rather than fiddling around with taking off the grip like many other markers (Including other Tippmanns' Egrips), all you have to do is literally push a button to pull off the little plastic door to the battery. You could probably even change batteries in the middle of a game if need be (but with the ability to flick a switch and change to mechanical, why?)
-Low Profile- I love how tight this marker is, even with a remote line (actually, more so because of it) it can be extremely maneuverable and doesn't get in the way during speedball. Between this and the accuracy, I was able to keep up during many intense rounds of hyperball. Usually, by the end of a full day of play, I have had at least 2 or 3 marker hits. With this, even after a full day, I only got hit once, in the hopper, and that was at close range (less than 15ft).
-Looks- This is a great looking milsim marker. Pictures are nothing like the real thing. I loved the SMG sort of look from the second I opened the box. The magazine is practical in addition to looking good, not only does it store tools for adjusting the electronics, but it is sturdy enough to also serve as a grip. It does, like all mags, tend to get caught on things, but that wasn't a big issue for me. The mag, along with the foregrip and sights can be taken off for those who don't like them.
-Ease of adjustibility- This marker's electronics are simple to adjust and you can tell what mode you're on without firing it. I also want to add that the new method of adjusting the FPS is so much easier than so many other markers that require sticking an allen in a tiny hole somewhere in an awkward positon on the marker (the Ion is adjusted from a nut attached to the air line, which requires a relatively large wrench to adjust.
Now on to the bad Weaknesses
Paint picky- This marker is very paint picky. The stock barrel is slightly overbored, and if you don't get a good match for the paint, it will waste air like crazy. The paint I was using when I played yesterday was very small (the best match we could find through a barrel kit was .679, and that was still a little big), and it literally took me 1k of air to go through half a hopper. I needed to borrow the field owner's girlfriend's barrel kit just to play that day, but the air efficiency was fine after that, filling up every three games or so. A good barrel kit is a must (My dad has loads of inserts for his barrel kit, including two or three repeats, so I already have a barrel coming in by Friday).
Electronics- This is more of a compaint against Tippmann's boards in general, but I really dislike the annoying "safety" features. You must pull the trigger 3 times before the electronics come into action at all, and if you don't pull the trigger again in less than a second, you have to pull the trigger another 3 times. Also, on full auto, after a string lasting 1 second, it stops firing, and even if you pull the trigger again in less than a second, you still have to do another 3 trigger pulls. I can (sort of) understand this on their other markers which will not fire unless the Egrip is turned on, but if a flip of a switch takes you back to mechanical, there's no reason to keep those annoying extra trigger pulls. Plus, new boards that don't include those annoying measures aren't out yet, and will probably be very expensive considering that I haven't seen any other problems with the board other than that.
Overall I was very impressed by this marker. If you're looking for a marker for speedball, you can probably get a lot more for $400, but if want a great marker that's designed with woods play in mind, but can keep up with all the other electros and hold its own in speedball, the Phenom is for you.