Well for snorts and giggles I'll give my own little review on the unit now that I've had one for a couple weeks.
In general the views voiced here of the unit are genuine and pretty consistant. In the nuttiest nut, nutshell I can derive, it's a great little box for a $100.00.
I didn't ebay, I just bought it new so I had reason and means to throw it back in someones face if it wasn't up to snuff.
Overall sounds just as presets are really good, they've managed to emulate a lot of tonal qualities of many amp, cab and effect combos. To improve on the realism of some sounds, playing through speakers is much better than through headphones as in any situation with a guitar, the harmonic elements associated to feedback makes more of a familiar environment to a guitar player.
Latency is probably the largest cause and affect in the unit. The bigger the computer, the better it sounds. Especially when you start using tones that have heavy delay, reverb and modulation. I've sampled the unit on a few different systems ranging from 1Ghz P3 to a 3.4Ghz P4 including a mix of laptop and desktop systems, I'm currently completely content with it on a P4 1.6Ghz Dell Laptop. I believe their minimum specs are too low, my P3 1.0Ghz Dell laptop started to choak on heavier sounds and this system is more than double the minimum requirements.
As for what I see as needing improvement, well not much. Same old song when it comes to solid state type reproduction, it does a good job but it's certainly not tube driven. With rhythm type playing/sounds, it's great, melodic passages could use a little heat behind the meat. Also, extremely fast articulate phrases start to sound a little wierd when playing long runs in excess of 140bpm as 1/16ths, it's as if it simply doesn't have enough time to reproduce the sound in the same manner as a slower phrase. The Effects are quite limited and in a few cases cheesy. The Wha-Wha is pretty much useless, the delays, too limited, the reverbs...WAY too limited!
But to finish my in a nutty nut, nutshell, if someone was pushing the buttons to change the presents, I could probably gig with this thing plugged direct to the board. I have no intension on taking it back and don't see anything on the market that can do what it can for the money or even close.
Any questions?