I must have watched every YouTube video reviewing this amplifier before committing to buy. I have a 4 ohm promethean cab so that seemed perfect, and it did, sound great through that. The compressed channel and boosting the gain gives a beautiful grit to the sound, which I really like. The tone control's are subtle, not giving a huge sweep, but, as one YouTuber reviewing the amp said, it doesn't really give you scope to mess up your sound.
I've used the Bluetooth to play a simple beat from a free app on my phone to play along to, no problems there. Best to switch off the Bluetooth before powering down the amp or it can get confused when you next try to connect. The only issue I have has is the toggle switch to turn the amp off not functioning a couple of times. Now I've cycled it a few times, that too is fine. If you're buying in the uk, note it'll come with an eu plug and adaptor. I'm sure it's fine but I liked neither the idea or the look of this when it turned up, so for a few pounds I bought a kettle lead to clover plug adaptor, and that works fantastically. I like the sound of this little amp so much, it's now got a feed out of the headphones socket, into a rack compressor, an exiter, and an eq will be added shortly, all this being fed into a 300 watt reference amp which doesn't colour the sound, running three cabs. It's totally loud enough for home practice just on it's own, if I were going to go jam with people now, I'd be taking the Joyo and running it though my bigger rig as described above, because the sound is so nice. Must be the valve preamp. For home practice or to run into a power amp for jamming, it's a no brainer. The next addition will be a D.I box fed from the effects look send. This amp is all you need