Vista Sync Center

I have a LT and DT, was using BeInSync (with about 16G of information) to
sync the machines, liked it other than the speed and lag it caused, also
conflicted with Trend. LT is Home Prem; DT is Home Basic

Q1: I can use Sync Center to Sync my work files, pictures, favorites, etc.,
between the computers, but I need higher than Home?

Q2: If that is correct, how is it working, I don't want to upgrade until I
know that it works well (keeping all of the files in sync).

Q3: I can easily upgrade to Business (have a 10 license pack), but is there
any major drawbacks, I know that I lose Media center in Home Prem, but I can
still play movies on the road - correct?

Q4: I used to upgrade all machines to XP Pro, but does anyone know about any
issues with machines (both HP) upgrading, any bugs to changing the Op Sys
that the machines came with?

I REALLY appreciate any feedback or guidance~!