Been using it on my desktop for about 2 weeks. Its great, runs wonderful (except one minor bug that keeps shutting aero off)
Its BETA so I dont expect perfection. STPD Drivers cant install on it yet (used to having a fake CD/DVD Drive on the comp to mount images)
I did a full fresh install. I had it on my laptop (b4 it broke on me) and it ran great on there too. My Laptop had more power than my desktop.
As far as Ubuntu, its wonderful I agree, I just get annoyed at 2 things. My video drivers, and how somewhere along the line my lack of experience causes a huge problem with an oterhwise everyday task for me.