I like it — most especially because I don't have to put any further thought to google and other data-slurping corporations. I've become very used to the gesture navigation system, which mostly works well and seems logical.
However, I recognise the app-availability will be a problem for many. I don't use many apps, though I would welcome a really good writing app and a really good calendar app, and a means to sync them. So far nothing to compare with what Psion offered two decades ago in Word, Calendar and Rsync!
My work around at length has been to use the gemini for my personal stuff, and use it as a hotspot when I want my Cosmo with Android to run a program that only runs on that. That way I can keep my personal data separate from the data-slurp.
If I had more time, I would be looking into how hard it is to compile stuff for the gemini. It seems to me that Sailfish has potential but is held back by an insufficient number of users. I don't know whether that will change. But for the moment I am glad to be using it.