Hello I have a MBP 13" Model Name: MacBook Pro Model Identifier: MacBookPro7,1 Processor Name: Intel Core 2 Duo Processor Speed: 2.4 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 3 MB Memory: 4 GB Bus Speed: 1.07 GHz Boot ROM Version: MBP71.0039.B0B SMC Version (system): 1.62f7 It currently runs on Snow Leopard, do you think it will be ok upgrade it to mountain lion? Will it be slower? will it be manageable at all? Can I bring it back to SL if anything happens? And will anything be erased it I upgrade? I will not back up anythin.