I had a SO flat in London from 2013 to 2016 and thought it was great, my only regret is that i didn't buy more than my 30% share at the time. I can't remember the website i saw it on but it was a specific SO property website, equivalent of rightmove.
I looked at a few properties and each company had different processes: some were key workers only (i was not), some would have an application window and choose the best applicant at the end, some were first to put offer in got it (that was mine).
There's a bit more faffing with legal as you've got a three way transaction happening, rather than just buyer and seller. Also you do all the legwork when selling (ie showing people around) yet the housing association take a fee from you, cheeky fuckers.
With ground rent etc the housing association were difficult at times as they kept trying to increase fees and overcharge for things. Fortunately everyone in our building got together and pushed back their bullshit, so it wasn't too bad in the end, but housing association will try it on so be warned. It's the same for any lease holding company I'd imagine.
I loved my flat. I removed some lights, rewired other lights, installed new wardrobes in one of the bedrooms, repainted the whole flat, and it looked great. Didn't have to ask the housing association. And it was so nice to know it was mine.
I'd say go for it if you've done your research on the company offering.