Its probably best to wait and see what reasonable and trusted reviewers tell about the device. Based on videos, Jolla is an extension of Harmattan. And although it looks attractive, as did N9 when advertised, there are many concerns:

My concerns are very simple, and these are issues that were deal breakers for N9. Its simple things that make the device usable or not usable, and below issues should be flawless on Jolla to be useful for the masses....which they are targetting to be successful.

1. Does it support ability to change the font systemwide....N9 didnt have it, and lost a lot of customers to it, because the fonts were WAAAy too tiny.

2. Email on N9 was horrible. It would not refresh, would freeze, and sometimes self uninstall itself (stock device). What have they done to improve that?? A corporate guy wants a phone that has flawless connectivity and sync

3. Text input: Very inferior on N9 as compared to other OSs. What have they done to improve text input. Type in English was painful and self correction was wrong many times.

4. Hardware quality. I had four or more N9s...and their quality overall was not good. it ranged from buttons being recessed too much or too little, the flimsy cover door bending and falling off, chipping of polycarbonate....Has JOlla imroved themselves in that department??

5. Calendar, to do syncing: WP8 and iOS are flawless, everything syncs and when I buy a second device, I can sync everything back to the new device flawlessly. N9 couldnt sync anything well, it was truly out of sync experience. What has Jolla team done to remediate this??

6. Lagging and freezing: lagging and freezing was so common on all of my N9s. Most likely a result of unfinished coding. Will Jolla deliver another unfinished product? To me, that would be suicidal for the company

7. Support: Nokia support was truly bad at the time. Jolla, a tiny company will need to partner with someone to provide support. Will it be there?

8. Jolla pedigree: If these are the same guys that brought us half polished Maemo and Harmattan OSs, what has changed in their DNA? Did leaving NOKIA truly change their ability to code finished products or will they always carry with themselves the handicap of poor and unfinished coding?? Its like contractors in Texas, changing company names, but building same shoddy homes....

In my view, as a regular phone user, Jolla has the burden of proof that is pretty high. I dont envy their position, the bar is high, and hopefully they realize it. I dont hear them admit mistakes with Harmattan and that is not a good sign. Unless they can openly criticize what was wrong in the past, and confront those mistakes, they will not be able to move towards the future of making phones for the masses.