Great product, comparable to Universal Audio OX Amp but it comes at less than half the price.
The cab simulation is spot on, it actually sounds exactly to the real cabs I have with the added features of noise gate, reverb scenarios, enhancer and EQ, not much else you can ask. You can also load your own IR's without having the monopoly of two notes only.
Regarding the attenuation, I would have payed even more for an impedance selector (8-16 would have been enough for most) and also an attenuation knob.
The two fixed attenuation levels are a bit of a miss depending on the amps you will be using. If you have a 100w head they are spot on but for a 20-30w, it's a bit of a miss. The first attenuation level is kind of OK but not enough to really crank it at home without disturbing, while the third is just too low.
If it's for a 100w amp I would have no complains since 1st level is OK for band practice while 2nd level for home use is spot on, although as said previously, I would have payed something extra to have more attenuation options, either a knob or at least an intermediate level between the two.
Regarding the tone, I haven't detected any difference in tone while using the attenuator, so my only complain would be the two attenuation levels and the fixed impedance.
All in all, fantastic product for the cab sim and digital features (9/10), but a bit lacking on the attenuation side (7/10).