So is it worth replacing WMP9 with 10 then?

[prathapml]

If you really use WMP, yeah would worth. Otherwise if you are a WinAMP fan it doesn't.

Sums up succinctly, the gist of what I wanted to say.

As a winamp fan, wmp10 is of interest only as an update that "somehow came out, so needs to be bundled".

Be warned - WMP 10 seemed to be sluggish on older machines for me (yes, even the final release, not just the technical preview). So if you have an older PC or support older PCs, WMP9 (of XPSP2) still is the fastest - and pretty sufficient for most purposes too. But otherwise, if you have a recently bought speed-monster, throw WMP10 at it and you'll only enjoy the re-designed UI - no negative factors.