Yeah man... love my Rize... bought it in May or June... put 24000-26000 rounds through it (maybe more)... no problems (except when batteries get low... which is every electro)...
Reliable... accurate... high ROF (compared to a mech)... not super loud... easy to maintain... consistent...
They run $250 new I think (at least they did)...
You will need at least an agitated hopper for it (I bought a Revolution because they were cheap and it works great... keeps up with the gun no problem).
Also used an Axe... those are nice too... but more expensive than the Rize though...
Like above reply I love my Proto Rize Max. I got to finally play a full day with it yesterday in the cold and didn't break a single ball and it shot great the whole day. I even shot two different paints in the same hopped and the gun didn't miss a beat. Shoots very smooth. The revolution hopper I used did okay with keeping up and only stopped me a time or two.
The trigger is super touchy so I may try to set it with a little more pull. You barely have to touch it to shoot and I ended in putting a ball into both the barrel sleeves I had to use yesterday.
The regular Rize new is $250. The Rize Maxxed $350 with upgrades like the case, clamp feed neck, on off air switch which is nice not to have all that air blowing out when you disconnect, and the two piece 14" ultralight barrel.
The Axe is also highly recommended and I've seen you can find one from $250-350 used.
Oh and make sure you have a nice mask to use. Had to shoot what you can't see.