Yes! I have used many soundfonts with it to make loops for export, I always keep a mellotron and a Rhodes soundfont on my phone (haha) and a little folder of drum samples cos you never know when you're going to be stuck somewhere with nothing to do, and when I'm not doing something I can't avoid like living life, working, whatever, I try to write/play music. Probably only 20 people in the world ever hear any of it, because I'm not interested in releasing etc. I just love the process of making music.
(Side story. I was in a pretty successful band in the Perth, Western Australia Indy rock scene in the late 90s that fell apart in spectacular fashion just as we got a record deal, resulting in debt, broken relationships, drug addiction and no record. It's made me highly averse to releasing my music and to working with other people. But I have been thinking about putting some tracks out on YouTube recently. I haven't decided yet.)
It's pretty powerful software, really, it's just hard to use on a phone screen. When I had a 10 inch tablet, I used to keep my Launchkey Mini in my bag with it, and often just jam or fool around with it. The individual modules, some of them are just amazing recreations of some classic hardware. It's a hugely underrated bit of kit. It's at least as good as Reason was the last time I played with it (version 3, I think it was).
If I could get it to run on my PC, I'd probably use it quite a bit on there too, because it's quite fun. Almost like playing a game. Alas, the windows version from the website just gives me a black screen with wine.
On a side note, does anyone know where I can get Caustic for Windows version 3.1? 3.2 doesn't work with wine but apparently 3.1 (or maybe 3.0.1) does.
Edit never mind, I just found the post linking to 3.0.1 for windows. Thanks!