Looks ugly. Very bulky. Lose front grip. Requires a secondary regultor and HPA tank.
While the LPK is rather fugly, I prescribe to the school of function over form. The benefits of the LPK far outweigh the minuses. I wasn't very happy losing my front grip, but got over it quickly once I gassed up my A5 for the first time after installing the LPK. Dialed the regulator in to 320 psi and started to rock. Much easier to keep the marker on target and it is significantly quieter. You will need a secondary regulator and a Nitrogen tank to complete the kit and can be rather pricey when you total it all up.
Not for the average player, but for the serious player that wants to shoot more accurately and save a little air to boot this is probably one of the best upgrades you can get for the A5.