If you're looking for a sound that is comparable to VST plugins, look eslewhere, because this does not raise to the same level.
There are several things that i'm missing from this unit: better distortions, more stereo FX (most of them are mono), the ability to assign pedal to more than just volume, wah or whammy... But really, i'm complaining too much, because for the price, you can't complain much. This is hands down the best you're going to get on the cheap.
So, as long as you understand that you get what you pay for, i can heartily recommend this one.