Owned a Tippmann 98 for about 3 years, and have shot about every inexpensive mech. marker in the world...
Empire Revo B hopper
Stock barrel - soon to be upgraded
stock grips, which stink
stock trigger, not bad
72/3000 PMI HPA tank
A faster hopper is necessary, repeat, NECESSARY. Will chop paint without one. I would also recommend wrap-around grips, and a better barrel, but other than that, I guess just pimp it out as you please.
EASY to clean, reliable, shoots uber-fast, consistent, EYES work well,
Really is hard to use without a fast hopper.
I have owned my MR2 for about a month, although as of yet have only played one full day with it. Here are my thoughts: this is a fantastic woodsball gun. It shoots well, I love the ability to shoot that fast. I put about 2000 rounds through it, and the only time I had a problem was when my hopper batteries died, and because I didn't have replacements I had to use a gravity hopper - then things went downhill. You have to pace your shooting, or you will be screwed. Also, it will occasionally not re-cock all the way, but I attribute that to shooting Co2, because when I switched to my HPA tank, I never had that problem.
It is a different feeling, having to rely on batteries - coming off my Tippy 98 where that was never an issue, and I can't say I am in love with them. But I guess there's no alternative, so just get a couple sets of rechargeables and use those bad boys.
The stock barrel performs well - not amazing, but it gets the job done. I shot a little under 2000 RPS Stingers through it, and only chopped a few balls when I had on a gravity hopper. I guess that's due to the ball detents, which other people have noted as being weak. I really like the adjustable trigger, although with this being my first electric marker, I guess I don't have much experience in that area... The stock grips are... well, junk. They don't seal tightly, and really leave the board unprotected from paint and other debris. So I would definitely recommend getting some better grips.
Also, the gun is remarkably easy to clean, and I actually think it is a bit easier to disassemble/reassemble than my Tippy. But, I guess that's subject to opinion. I really don't know what else to tell ya, this is my first review, so if you have any suggestions let me know and I'll try to improve.
I definitely recommend this marker. Great for woodsball, and I suppose it would hold its own on a speedball court too. Has been reliable so far, although I'll update this if I encounter any problems, I suppose... Gotta give it a 9, nothing's perfect and this is no exception. I really haven't had enough time to formulate a rock-solid opinion of this, but eventually...