Maybe it is a little bit early, but I had loads of fun with Blackberry phones and Android phones innstalling different rom's. Some of the rom's made by the members of crackberry and XDA where even much much much better than the orginal rom's. By the way my old Motorola Razrm Maxx got 7 days of moderate usage with a custom rom on one charge
With that said sometimes it feels like the battery on my Ativ S suffers from glits in the orginal rom. I travels faster from 100 - 70 % than from 70 - 30% and so one. On the other hand this is a new phone and there will be updates and the windows 8 rom can only be better
I?m only searching for the original, aktually rom. By HTC you can find it, but not by Samsung. I get no updates, and I think I have an older rom on it.
What updates are you looking for? Mine has not gotten any updates either... Bad thing is when you go into settings and About, there is no rom number, mine says only Windows phone 8...