If your application works fine in SP1 there's no reason to upgrade to SP2.
SP2 does address some issues under Vista and fixed some bugs but it also introduced new bugs some of which still not fixed. See http://fox.wikis.com/wc.dll?Wiki~VFP9SP2BugList for details.

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>What are the reasons why someone would vote against using SP2 and stick on using SP1?
>I just wonder since I believe there are not so many reasons against using SP2, specially the HotFix on SP2 correcting the multiuser bug.