I suggest you head over to Amazon and read the review by C. Kelley. No affiliation. About the third one down. He hits all the major points briefly and does a comparison to a host of cartridges, most of which I own (except for the Dynavectors) so I was able to follow along very well. I think our tastes are similar, though he likes his V15/SAS way more than I do. He LOVES his OM30 Super, which I do, too.
Bottom line seems to be that if you're a tracking nut, can't stand IGD even a hint of it, the .3 x .7 elliptical might not do it for you.
I have the OC9ML/II. I wouldn't mind a comparison to that. That has the ML tip and the boron rod cantilever, both of which are supposed to be better than the Duralum and elliptical on the AT33EV. But I do find my OC9ML/II a bit etched, so perhaps a .3 x .7 elliptical would be nicer in my case. The Amazon reviewer says that the AT33EV is more natural sounding than the two AT MM heavy hitters the 150MLX and the 440MLa and has more body, and better noise rejection.
For me, though, my AT150MLX is more natural sounding, has more body and certainly better noise rejection than my OC9ML/II. My OC9ML/II loves to find any flaw in the groove and focus right in on it to let you and anyone else listening know that it is having a hard time with your record collection. The AT150MLX with same cantilever and tip is the opposite: Dead quiet in the groove. Lovely detail. Very realistic.
A good buy at $500? Not having ever heard one, I think you could do better. Honestly, if it were me, I would probably spring the extra cash and get the AT33PTG/II which is also hovering around $500. The AT33EV seems really to be hovering at around $425 to $475. For the extra money you get a tapered boron cantilever and a Micro linear stylus.
Some light reading for you:
http://theartofsound.net/forum/showthread.php?33964-Audio-Technica-ATOC9-MLII-vs-AT33PTG-vs-AT33EV