I've had time to test a bit more and the mms problem i had (and i'm not the same, i've noticed a few users posting about it between the different CM threads) is still there (nooo :/).
Basically, sending or receiving MMS crash the Mobile Data and you have to reset it manually (disable/enable) till you manage to get the MMS or it ends up being marked as "failed delivery" and stop trying. No idea why, can't pinpoint the problem (it's the same on nearly all SMS apps, be it Chomp/Falcon/QKsms/Disa/Hangouts, the only one that seems able to partially work around it is Textra.. but only if i'm on a WiFi network at that time, otherwise it has the same problems
).
For the rest it's still quite stable, but i seem to have a call problem back that was gone, aka i need to play a video after reboot to be able to be heard/hearing people on the other side during calls.