I'm looking at getting a Specialized Rockhopper Comp as a graduation present and was wondering if anyone has any experience with them.
I just want it for some trail ridding.

I had an 08 (I think) Rockhopper, for 2 years, and just upgraded to a 2010 Giant Trance X3 last summer.
For the price ($700) it was a pretty good bike, light, pretty durable. Definately something suitable to get accustomed to trail riding on.
Whether or not it will work for you depends on where/ what you will be riding. If you're doing light XC, bike paths and street riding, then it will work out. If you're planning on heading into anything harsher/ more challenging, you might consider spending a bit more money on something that will perform better, and last longer.
Other bikes you may want to check out around the same price:
Scott aspect 10 ($1000)
Scott aspect 20 ($800)
Trek/Fisher Mamba ($910)

I have a stumpjumper comp 4. Its got the way better components on it but its the pretty much the same frame....Only thing i Don't like with the rickhopper is the shimano Alivo rear derailer. They kind of suck for shifting in a hurry they can skip. The SR Suntour forks on it are okay. I blew out my fox forks last summer and just couldn't afford the $700 to put good ones back on so i spent $280 for the same forks that the rockhopper comes with. Both the forks and derailer will be good enough for non serious mtb. One thing i would SERIOUSLY consider is spending $100 more and get the 29er' the 29 wheels are the way to go for off road and the way of the future. The 26" wheels are slowly going away for off road mtb. The larger wheels are way smoother over the bumpy stuff. Plus it looks so much more bad ass.

I'm going to sell my stumpjumper after this summer and build me a 29er' from frame up this winter.

29r's are more for XC riding. For AM or DH, 26 is still the standard. I've tried a 29" DH bike, the Intense 2951. It definitely rolled over rocks, ruts, and roots better than the 26", but failed in very technical switchbacks and is much harder to pin a corner with.

The Specialized RH is a tried and true frame. If you can afford it, stay with at least Shimano Deore or SRAM X7 parts gruppos.