I have been using the latest version of the unstable branch. I use it all the time and have had no problems at all. All my hardware, including my SMC USB WIFI is working fine.
I have installed some applications that I use for my businesses. They installed fine, they run fine (LedgerSMB), Opera 9.50, Bluefish.
The system is responsive and fast, just what I wanted. Thankyou.