I use this amp for home practice and digital recording for 1.5 years now. I still like it very much.
Works out of the box, almost every preset sounds good and it's very easy to make them sound great. Works very well on Linux, too.
This amp has a MIDI interface for control messages (CC), but not for guitar pitch to MIDI note conversion. So it's not a full MIDI interface, but CCs might be useful for some people especially since the pots are nice. So actually you can use it as MIDI controller independently of the guitar amp function, which makes it even more versatile.
I have a Linux system, so in that world Jack/Ardour sees the audio and the MIDI control interfaces -> turn the pot, you see the event in the DAW. So it is not a virtual instrument, but it's OK for control.
You can record digital audio from the guitar and send audio from the computer to it at the same time (e.g. backing track). So you can use this as an external soundcard over USB, no need for an audio interface as long as you don't connect other analogue devices. The USB stream is 48 kHz/16 bits, but this is directly sampled, not through a mic, so clean. (CDs are 44.1 kHz, 16 bit). 48 kHz means your computer doesn't have to go crazy processing, either. All playback from your computer will be played along with your guitar on the amp straight away.
The amp is extremely versatile. It can do clean, but it can metal very well, too. Usable without the phone app, just by dialing things in on the amplifier interface, but the phone app is great, too. Works well with the analogue potentiometers of the guitar, too. Eg. crank up the volume in drive and you get more distortion, the way it should be. The headphone setting is great. The music input is either via Bluetooth, jack or USB. And it is loud. This is no ordinary HiFi-style 25 watt, as you'd expect.
By now the phone app has caught up with the quality of the amp, it's super intuitive.
In summary this is a true Marshall amp, but at the same time a high quality digital product, worth every penny. Take it out for a spin, you won't regret it.