It's incredible how many realistic amps this little thing can deliver.
It makes you want to play more...and that's the important thing.
I wish I had this back in 1985 when I was a teenager.
Since I already rated this with well deserved 5 stars, I will add some cons:
1) ad/da conversion rate is 16bit/44.1kHz. Should be 24bit/48kHz.
2) the device should be manageable via a desktop app/USB. SInce you plug the USB cable for recording, it's a bit annoying to also have to use a mobile app via bluetooth (bluetooth makes more sense for the spark-mini)
3) There should be 8 knob presets (a LEAD preset is missing between CRUNCH and HI-GAIN) and they should be editable. The 4 switchable presets would then be redundant. One single place for changing the modelled amp would have been better.
4) The sound is a bit dark ~"bassy" (not annoying though). Luckily there is a useful EQ in the effects section that can help with that.
5) There are a few sounds on my VOX VT20x (in which I swapped the default speaker with a Celestion 8/15) that IMO are better, maybe due to the 24bit conversion rate or the loudspeaker. I bought the VOX new here at 159 EUR and the Celestion speaker at 30+ EUR. So with about 200 EUR (i.e. 90 EUR less than the spark, 2,5kg more) I still think the vox to be a better choice. The vox tone-room also offer more customization for amps and effects (unfortunately the vox doesn't have an USB audio interface).
The spark is also one of the few modelling amp with good sounding presets. The glassy and crunchy presets, even if not my first choice as far as the modelled amps go, sound really really good without any tweaking.