Thanks for this mini review, I really wanted to know how does the latest release run on the Gemini. I really hope they'll fix the microphone/earphone issue, I'd like to use Sailfish to make calls too when I'll install it.
I've been using sailfish since it was first released for the gemini (end of June I believe). The call problem is annoying, however you can still use it as a phone. I hold the phone a little away from my ear by wrapping my fingers around the gemini. Whilst slightly annoying, it is far better than using android
Anyway, to answer your question, sailfish works really well on the gemini. I am a unix dev, so for me it really is a small laptop. I have access to all the usual utilities via the shell, and have installed a full dev environment. I patched/compiled dosbox completely on the gemini. The browser is great, even better with the latest release. It is more like a desktop/laptop browser than a phone one - which I like. It is older than other browsers, and you could run into problems with sites that require absolutely up to date browsers. For my usual browsing, it works perfectly. The only thing I was really missing was wifi hotspot - which is now working on the latest sailfish.
Now I am not a normal user I suspect, however I can say that sailfish is very usable as a primary device, provided you aren't app driven. Sailfish app support is not as good as the other main platforms for headlining apps (netflix/twit-face-agram etc). I tend to just use the website for any of those I need.
If I ever get time, I am going to look into the pulseaudio problems - I was given some ideas from Adam (gemian) from what he had to do. When gemian has a day to day usable phone stack/app, it would be worth looking at that - but until it does, sailfish works a treat.