I am not using WF5 fully yet, but all my testing shows it to be very stable. If you are getting new hardware, you should not have any of the issues I am seeing with an older Workstation. The Dynamic edit and model shadows takes more power than our Workstations can handle.
There is an issue with Dual Monitor Drivers, so if you experience a crash and have a Dual Monitor setup, you may need to update your drivers.
"Too many people walk around like Clark Kent, because they don't realize they can Fly like Superman"