I just did this update. I downloaded the file and pressed shift and clicked on the update button in itunes and updated to 347.
I have not have my phone crash since then, and the phone seems slightly zippier.
on a side note, it looks like Aurora Feint is going to be pulled from the itunes store. Its because it sends your unencripted contact list to aurora's server if you use the community function. Apple is not too happy about this and is taking it down.