This is by far the most buggy beta I have tested from Apple. The biggest problem is that even though I am able to put files into the Trash Can and delete them, The free space on my hard drive does not change. I have deleted well over 40gbs of data and nothing. Also the fans on my MBP run at 100% all the time and the only source of significant heat seems to be around the Magsafe connector. I wish it wasn't such an incredible hassle to downgrade.