just like it says there..

i have a chance to get all these pres (the MPX 550 and Rev 500 are second hand) at more or less the same price...

although the MPX is actually an MPX 500 with a Chip 2 upgrade...whatever that is...i must admit I'm not very impressed by it...anyone ever heard of this?

anyway, what do u all think, since they're all the same price and i can get one of them...

tanx..