Well check the wiki here on TMO. There are people against OC and in favor of it. Currently I'm on KP49 and on DSP profile if I dont forget to turn it on generally the stock settings are good for me. The profiles like ULV, XLV... are supposed to save battery and give performance but it is said that the calculations in it are wrong/not perfect and should be tweaked for each device. Sometimes in daily use I think that OC is overated. For answering cals and sending sms 600mhz on standard stock settings is OK.