After two weeks I’m all in on the GT40. It's not an expensive amp so it has its limitations. You shouldn't expect a high end device. That said, it's pretty darn good. I am no pro at creating tones. It takes some patience and trial and error at first as there is a slight learning curve. It’s not about the user interface on the amp or the App. They are easy and intuitive IMO. It’s about all the amp models, speaker cabs and parameters and getting to know them. There are a lot of the possibilities. The things I like: the bluetooth streaming of music and backing tracks. The bluetooth is excellent. I stream from youtube, a "slow down" app or my music library without problem and the stereo configuration yields excellent quality. It’s a 2 x 20 stereo amp configuration. the ease of using the App (speaking of iOS only as i hear Android has some issues) It makes it easier to edit patches and download patches etc. Plus, not having to connect it to a Laptop or Desktop. It’s one less cable and inconvenience. The clean and "edge of breakup" tones that are readily available. The endless ability to tweak a setting to achieve a desired sound. I think you can find or create almost any artist you can think of. the potential of downloading excellent presets created by artists and the online community. The things I don't like: many of the default presets are “not all that and a bag of chips” (but don’t judge the amp by what you get out of the box) the amp can sounds a little boxy on some settings although this is easily corrected with a little tweaking. Although the App is excellent it needs some refinement in some ways, but it should get better as Fender add enhancements. Tips: -Some suggest that one of the 4 x 12 celestion speaker cabinets is the cure-all for the boxy tones of some patches/models. It's not. It varies by amp model. For instance, I got the best results on one model by using the Twin Reverb cab. -Once you create a patch it's easy to use the amp’s Eq and gain controls for minor changes if switching from a single coil to a humbucker guitar. I have found that it is necessary to do this and it makes sense. If you’ve created the patch for a humbucker, chances are that the gain and high end would not fit a Tele or Strat and vice versa. -you have to go to settings and connect bluetooth each time you turn on the amp. It may help if you put your phone on “Never” for sleep options. -some things in the App are funky. For instance if you choose “Create a preset” and select an amp, you also have to name the patch before you can get to the edit controls. -You control music you are streaming by the volume on the source, not the master volume on the amp. You have to balance your guitar level and your music level. -I really like the Range Booster as a stomp box. -Moderation! With almost limitless delays, stomp boxes, reverbs, cab models and the ability to adjust “sag” and “bias”, it’s easy to overthink things. Keep it simple at first. Don’t change too much or else you won’t know what improved or hurt a tone. Bottom line for me: The GT40 is not a gigging amp. I've had one for two weeks and I'm very pleased overall. Is it perfect? No, but it's great as practice amp and low volume home/bedroom use. The audio quality of music streams is excellent. It's almost exactly what I was looking for in terms of features. However, it's not a Helix or a Kemper. Guess what, the Code, Katana, Peavey aren't a Helix or a Kemper either. It's a $250 amp for goodness sakes. (Then again, I've been labeled as tone deaf.) However, I have a nice Peter Green tone, an awesome Blues tone (think Ronnie Earl); a Gary Clarke “If Trouble was Money” tone, a marvelous clean setting (stock) and I've downloaded excellent patches for a Gilmour "Time" solo, Knopflers "Sultans" or "Lady Writer" (nice compression for a percussive attack) and a few others. I created a Keef Midnight Rambler tone this morning in less than 5 minutes. I'm getting better at tweaking it. I would buy it again. YMMV.