Aosp are generally getting a lot better, a few reboots every day is to be expected, however. The phone is quite moddable, you can install custom recoveries and flash custom Roms, although the bootloader is locked.
You will miss out on quite a few features, but some of them can be flashed back. You might find stock best for you and since you are an sgs2 user I'm sure you will appreciate the fact that dorimanx develops kernels for this beast. Best of luck.
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