Windows 7 RC 1 works fine today and so did the Beta.With MicroSoft's track record, I'll give Win7 a try after SP1 or SP2.
I'm ready for Snow Leopard now.If the promises are true, my machine will be faster just from upgrading the OS. And there are several programs I'm interested in that requires Leopard. (Still using Tiger here.
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I didn't encounter many problems in 10.5.0 besides Time Machine and the occasional X11 hiccup. That was ages ago though.