i wouldnt recomend zedomax on 2.3.6 as when i tried it i lost my wifi and ended up bricking my phone, i have now unbricked my phone and rerooted it to zedomax and still have no wifi im currently it the prossed of flashing a custom ics rom that should give me wifi back,i will post links if this works until then i wouldnt root unless you dont use wifi or have other motives for rooting your phone,ive heard the wifi problem only affects att galaxy s2 running 2.3.6 soo any other carriers should be gravy(from what i hear)