Angel - MUCH more accurate, but not as fast as an Angel (but we are comparing electro to mechanical)
E-mag - Again, the GX4 was more accurate, but the E-mag has an insane rate of fire (and is quiet a bit more expensive to operate).
Dye Ultralite - The GX4 weighs more, but also seemed to have a significantly higher recharge rate (translating into an effective rate of fire without pressure dropoff). The GX4 also doesn't have the weak point where the reg screws into the body (it's pretty think on a ultralite, a good head first slide could trash the Dye).
WGP Oracle - Same comment as with the Dye, much lighter, but the GX4 feels rock solid and performance of the GX4 seems much crisper (especially with the new hinge trigger).
ANS GX-4 (prototype - didn't have barrel)
Smart Parts Freak Barrel
Ricochet 2k Hopper
Nitro Duck 68/3000 tank
If you are a front or mid player, the stock barrel should be fine. Back players will probably want to go with a longer barrel. I prefer a Freak set. A Boomstick would be fine, but it's a fixed bore size!
The upgraded front end and hinge trigger are the heart of the upgrades to the GX4. I actually had a ref ask me if I was shooting with an electro grip! The hinge trigger is the best I have used.
The combination of well-known autococker accuracy with the rate of fire the new front end & trigger offer is a lethal combination. From a back to mid position, I am able to get the same number of kills as an Angel or E-Mag with a fraction of the ammo!
The aesthetics of the gun is amazing. The finish is beautiful. I actually had a guy offer to trade me straight across for an LCD Angel!
The operating pressure is incredibly low. ANS claims 250-300, I was fortunate to have a really talented airsmith work on mine. The gauge on the reg shows 180! This low pressure configuration together with the redesigned front end translates into the first Autococker I have used that merely sips air (most cockers are gas hogs). I can shoot nearly 1000 rounds on my old 47/3000 tank. My new 68/3000 runs all day.
The new beaver tail doesn't have the ringing problem the old GX3's did.
The GX4's come with the redesigned ANS bolts. The new ones were specifically redesigned to address the issue of bolts coming loose and shooting out the back.
The quality is top notch. So is ANS' customer service.
Production models don't come with a shroud (but how many cocker owners play with a shroud)? ANS will sell you one for $29. They will even match the color if you send them a part.
It's a bit heavy (as compared to a Dye Ultralite).
If you're going to spend under $600 for a marker, I like the GX3. But if you are even remotely thinking of buying a GX3 and upgrading, or you are looking at an Outkast, Ultralite, Oracle, etc., do yourself a favor and go with the GX4. It sets a new standard for high end Autocockers without breaking the bank.
The enhanced consistency and higher rate of fire found in the GX4 compared to the GX3 means more kills with (suprisingly) less ammo.