If you don't have one of this or from another brand, you are missing out one small gadget that I use every day and recommend to everyone that plays at home.
You plug it in the guitar with the headphones plugged and just turn it on and start playing!
You have to check some video guide online, because there is little instructions in the package..
I hope the brand does a new version, where they include a instructions manual.
That's said, you have a lot of options to set it up.
I mainly use it in distortion mode.
As for the quality, is made mostly of plastic that's seems ok.
But the let down was to see that they use stickers for the amp part, this could have been painted and be part of the main design.
The sticker gives a cheap feeling to the whole device.
I still recommend it, as it is very useful to play quietly while still hearing the sound as it was from a really good amp.