Lack of interior grip space
Lack of wiring channels
No auto shut off
I bought an eGrip a few months into my paintballing career and was happy with it for awhile in comparison to the stock grip. After all, how could you not like gaining a whole new range of new firing modes (especially if it's your first marker)? The good is that the grip is very durable, easy to remove, easy to get into and you can get 20+ BPS with a QEV. In the months since, however, it's drawbacks have really started to sour me on it.
For starters, the stock board (W.A.S. Equalizer) has no auto shut off and you must turn it on to use it (as opposed to, say, A.P.E.'s Rampage board which only draws power when you fire) which means it devours batteries. Changing the battery once a day or once every other day that you play is not uncommon and I use Duracell. In comparison, the Rampage only requires a new battery every half dozen games or so. And don't get me started on the ridiculous setup of the interior. There is no good place to put the wiring to the battery. You just have to lay them on top of the battery, which means the trigger group presses down on them, which can't be good. There's even less room for the solenoid and capacitor wiring. You have no choice but to sit the battery directly on top of them which, again, can't be good.
A couple of small spacers incorporated into the mold of the grip would have solved one of these problems and another 1/4" of length on the grip would probably solve the other. Did no one think of this or was the product rushed to production and never retooled? Either way, Tippmann should have been embarrased to have charged $150 for this product. You can get one now for $100 but I'd rather have paid $150 for an upgraded grip, with these issues addressed.
Also, the programming on the Equalizer is much more tedious than the Rampage (the only other product I've used to compare it to so far). You have to go into idle mode, then into programming mode and then into firing mode. With the Rampage, you just click the mode button once to advance to the next firing mode and just keep clicking to cycle through all of the available firing options. Oh and did I mention that the Rampage is waterproof?
And finally, although you get the various organizational settings (NPPL, NXL and PSP) on the W.A.S., there is no 3-shot or full auto options without ramping, which you do get on the A.P.E. If you need the organizational settings or if you can't find an eGrip with a Rampage board, try finding an eGrip and trigger frame to put the second board into so you can have two full grips that you can just switch out. That way, you can use one for tourneys, one for rec ball (or whatever) and if you ever have a problem with one of them the day of a game, you'll have a backup.
If you have an A-5, you have to have an eGrip, but if you can find a grip with the Rampage preinstalled, I'd highly recommend going that route unless you need the tourney settings, in which case, follow my suggestions in the last paragraph of my review body. I give it a 10 for the durability of the grip itself, a 4 for the durability of the board and wiring, a 5 for ease of use of the W.A.S. board, a 7 for the programming modes, an 8 for performance and minus 1 for all of the issues I've had with it which equals a 5/6.