I have also migrated from a N9 to a z10 (BB10) and I must say that overall I am not regretting it.

What I loved about Meego was the community like this forum, the spirit of open-source, developers making amazing application, hacking the phone, ect ....

BB10 OS is fast, stable and I am very productive with it! I have never cared about having 1000 applications on my phone but I quite a lot the core ones like e-mail, sms, ... so bb10 is a good fit with my demands regarding smarthphones.