I think they are doing well, in the sense that they are entering more and more markets.
However, they are probably late compared to their first hopes.

So the true question to me is 'how long can they cope with having mid-success?' or said differently, how long their investors can wait for a return.

I am still optimistic as the cost in running their business is pretty low (due to the size of the company) while their prospects is pretty high: even a 1% of the market is huge for them (that means many devices sold per Jolla employee).
Additionally I believe the brand is more and more well-known, due to their different launches (estonia, kazakhstan, hk, india, namibia) and to the use of the android community (xda-dev).

What is still pending is their success in promoting the OS with other phone makers. This is still to come. Or maybe they have changed their plan and will only delivers to consumers directly (via Android launcher and hadk), as makers are not responding yet...

At the end, I have no idea how many Jolla they sold but during HK launch, I think the CEO was quite ambitious:
http://www.phonearena.com/news/Jolla...ile-OS_id59610