I have had this a while now an I have to say I'm impressed with it. Is it the best sounding amp out there? No. Would I replace a practice amp with it no? However, what it is is extremely convenient. I often have to be away at weekends for a couple of days, so instead of lugging my 20W combo (not that it's huge) around, I stick the Go in my gig bag with a cable and that's me. On Wednesday, i had a bit of time to kill, so was able to sit in the car and play. The four built in presets aren't great, although the higher gain ones are better than the clean channel, which is also very quiet, but when you pair it with the app on your computer, tablet or phone there's a huge range of presets and you can change the settings on them. You can use the app to play along with songs, or use the smart jam facility to make your own music. It actually sounds rather good through headphones. It also functions as a Bluetooth speaker, which is an added bonus.