I randomly found this device while looking for a compact a useful practice tool for both playing and traveling.
The only negative for me would be the way with the mobile app: you can save 4 (more than enough) BUT you can . So, if you like the amp number 5 and want to assign it as one preset, you can’t. You have to overwrite one of the first 4 banks.
Nevertheless, after some tweaking you can a decent sound. Plus, there are presets uploaded by other people that you can download and change to your needs.
Let’s see how it works after a few months, but for this price, I’m more than happy with the purchase.