Tippmann Custom Pro (doesn't really compare that well, except that it too is an all-mechanical woodsball marker)
AGD Tac-one (RPG Minitac Pro)
Deadlywind Fibur CF Barrel
Tippmann SSL-200 Hopper
68/4500 carbon fiber air tank with Ninja reg
ULT (Ultra-Light Trigger pull kit)
Barrel/barrel kit to more closely match paint to bore
Not the most air-efficient
I have now used my Tac-One for some time, and decided to write a more long-term review. I purchased my Tac-One from Rogue. It was one of only about ten RPG Minitacs. It has a milled down body, ultralight grip frame, ULE rail, splinter trigger, clamping feedneck, dual ball detents, and is done in a dust black paint job. Other than that, it's a standard Tac-One. I have owned it for over three years now.
I played with the standard setup for the first couple of months, then decided to add the ULT. My firing rate increased dramatically. It's a great setup because you can fire at a pretty decent rate, if you so choose. Or you can fire at a slower rate and save paint.
Although I like the look of the Tac-One, I really don't use the Piccatinny rails. I have long since given up on red dot sights, bipods, flashlights, and all other random crap that just adds weight. But I still love the look, even if I never use the rails again.
AGD is known for creating some of the most reliable markers in paintball.
The Tac-One uses the X-Valve and Level 10 bolt, which are just incredible.
There are no boards or batteries that can fail. There are no settings to mess with.
It will not crap out on you in the rain or in cold weather.
Once you have it tuned properly, you should not have to change the setup.
And if you do have problems, there are excellent support communities at M. Carter Brown, PB Nation, and even AGD's web site. And then there's AGD's customer service, which has a longstanding reputation for outstanding support.
If you're looking for a 20-bps firing rate, you won't find it here...but you really shouldn't need that firing rate to hit someone.
It requires a higher operating pressure of around 800-850 psi, so you won't get quite as much life out of your air tanks--you really need at least a 68/4500 for it, otherwise you'll have to change out tanks too often. And it isn't quite as air-efficient as some other markers out there, so you won't get 2,000 shots on one tank.
Getting your gun tuned up initially may also take some time and tinkering since there are shims and carriers to adjust in the valve and more shims to adjust in the ULT. But you should get to know your gun anyway, and will then be better able to troubleshoot your own problems.
I have had only a few, rather standard problems over the years. I have had the gun begin firing on full auto, which was solved by removing a shim from the ULT and making sure the on/off is put together tightly. I have had the bolt stick briefly, but that was caused by wet o-rings on a very rainy, humid day, and it reset itself after turning the air off and back on again a few times. Once the bolt would not reset because a piece of teflon tape had shredded and gotten stuck inside the valve. Again, these are routine maintenance issues that could happen with any gun. Just know your gun, and you should be able to fairly easily solve any minor problems like these. In the three-plus years I've been using the gun, I have not had one o-ring fail on me. The only problems with leaks or have been due to fittings not sealed tightly enough (my fault).
I have used this marker frequently over the past few years during rec games, scenarios, and in two woodsball tournaments. It looks great, works great, and fires just as well as most guns twice the price. You may not be able to tap the trigger like many electros with magnetic triggers, but you will be able to fire plenty fast with a ULT. If you want a reliable, mechanical marker that will not fail you and will last for decades, look no further. There is a reason why AGD does not come out with new products--the ones they have really don't need improvement.