Heya,
Yeah, it will take awhile if your doing an upgrade like that, but it's almost ALWAYS faster, and better even if it's more of a hassle is just to copy over your files to another drive, and do a clean install of an OS, IMO. Plus, it will install faster too, and less issues that might arise.
When I played with Beta, and RC, it was smooth. A few bugs here and there, but it was very solid, and stable. I'm just still not understanding all the "Bloatware" that Windows has on install, tho. Was it 10 gigs? Which is insane, even if HD room is cheap.
Oh, well. I'll get 7 soon as I get back on my feet, and I really do need a new computer, fast. I'm on a 5 year old desktop with even older Graphic's Card since my PCI Express burnt out a year or two ago. =)
Hasta,
Ali