Finally I decided to give it a try on my old Nexus 5.

Flashing was pretty straight forward.

It looks very good.

I will take it for a ride for the next few days as my daily driver. Only app I miss is the Waze. It is ok, I am in town this week, so no need for nav.

Few issues (after few hours usage):
1. Copied ~/.local/share/commhistory folder from my Jolla - because only thing local that I really need is my sms and call log. Messages and log came through, but for some reason new messages and call history is not getting saved (Update: A restart fixed it). It is so cool that you can scp files between phones over wifi.
2. Pairing Bluetooth - finds the car audio and seems like registering, but never saves it. Update: Successfully paired with Bose Soundlink Mini and after that, I was able to pair with my Mazda without any issues. Don't know what the issue was!
3. 4G connection issues for data (USA T-Mobile). 3G seems to work good.
4. Default fonts in Terminal and a few non Jolla apps like Whatsup is really small. Whatsup, currently no option to update, I can play with the qml, maybe later, or wait for CepiPerez to come up with the right fix.
5. Double tap to wake up the screen does not work (even after mcetool --set-low-power-mode=enabled) Update: It works from LPM screen.
6. Phone audio seems to be too low.
7. Need to get used to Volume buttons on the left again. Hung up couple times trying to increase volume and pressing lock button instead.

No show stoppers yet for me. I love this bigger and better screen. I can even see the screen in daylight outside.