If you are using sheet metal and are thinking of upgrading from 2012 sp3 to 2013 sp1, DON'T
This install is less the 24 hour old.
There is an intermittent but repeatable bug but that fails to enable flat patterns to flattern.
I have sent an RX to my var.
Bend lines intermittently show or not.
I had my first crash when trying to edit a hole in a sheet metal part.
Auto crash report sent to Solidworks.
Auto regen of a flat pattern makes the drawing lose it's dimension, grain direction and fixed face links.
Hole tables not updating, requiring table deletion and re-insertion.
I have not yet upgraded the work machines yet, phew!