Funny since I agree about mobile radeons being like this where every update is a risky thing however I moved from Nvidia only (after my one ATi 9800 Pro) to AMD due to the drivers stuttering, breaking and finally making my 8800Gts 320 unusable in games because it wasnt the magic 640mb edition.
I've since had 5770, 6770 (same card but in fire), 290X, RX580X, and now 6750 without any issues.
iGPU stuff however has been awful but then again so was my Intel/Nvidia laptop having problems with iGPU fighting the dGPU.
In my case, all of the configs I described were desktop builds, as I am not willing to touch a windows laptop with a 10 foot pole again, and in general gaming is the last thing on my mind when considering a laptop.
I've since had 5770, 6770 (same card but in fire), 290X, RX580X, and now 6750 without any issues.
iGPU stuff however has been awful but then again so was my Intel/Nvidia laptop having problems with iGPU fighting the dGPU.