I have a Nerve and a Shocker and they're just as good as each other.
The Nerve failed becuase it had to compete directly with the Shocker, was piss-poorly advertised, and was upgraded to the max out of the box, hiking the price a lil bit.
The Nerve is easily a tourney spec marker, will fire as fast as the majority, easy to maintain, easy to clean and doesn't need anything doing to it. The LPR is handy for reballs, brittle paint etc.
If you can get one cheap and want a damn good marker go for a Nerve.