I use this product about two months for home practising and it does what I expected, even though that the usage of the controls is sometimes bit confusing, the built in drum loops are handy for home practising, maybe they could bit louder (I have set them to max), unfortunatelly you can not adjust tempo of those loops, but there is built in metronome too. Nice feature is that you can plug in some other device to play back tracks, but you can not adjust the volume separately. The build in tuner is also handy. There are lot of sounds and presets, maybe too much, but I'd say many of them are very similar.
Addition to my previous evaluation:
The device died after 4 years then I consult it with service and it doesn't worth to be fixed, the only way how to fix this is replace the motherborad. The repair would be more expensive then a new one, so it actually means it's made as irreparable. I had opened it up to see what is actually inside well.. glue everywhere, poor made I'd say.