I don't know how many, if any at all, are still on board from the original company but I really had high hopes for them. I used N810, N900 and N9 from Nokia. That OS (maemo/meego) then eventually matured to Sailfish some time after Nokia was already either down or going that way. I really liked the first Jolla phone, it had something in it which none of the android slabs I've then had doesn't. They had at least some kind of market share, promising applications coming up and, at least in my opinion, at that time, very real chance to challenge Android/iOS on the market.

And then they blew it all with a massively oversized kickstarter for their size. I haven't followed too closely what actually happened, or could that been avoided, but that blunder meant that I haven't really followed Sailfish or Jolla since. I really hope they succeed, the market needs desperately at least one more player to challenge walled gardens we currently have, but previous experience says that I'm not going to throw my own hard earned money on them until they show they can actually stay on track.