So my first 4s was getting really hot every time I charged it, and combining that with the battery issues I was having a genius swapped it out for a new phone a couple of weeks ago. 2 weeks of great battery life, fast apps loading etc. Yesterday, I intended to do the OTA update, plugged in to Itunes and backed up and then thought (so so so stupidly!) why not just update through itunes - yes, now I know that it downloads the ENTIRE OS. So, 35 or so minutes later I had 5.0.1 on my phone. And ever since I am back to the same poor battery life of my first 4s. Quite disappointed. Before deciding to go back and swap out again I plan to drain the battery and recalibrate and see if that helps, if not I will get a new handset I guess. Jealously reading all the people's great 5.0.1 experiences, especially as my battery issue was over for 2 weeks..