Actually what I think you should do is grab the Crysis demo and have a mess around with their UI stuff. See what you think of it and how it works, that should give you a good indication as to what scaleform can do.
I believe the big question is price. Is it worth the expense of buying Scaleform per sku, or is it more cost effective to create your own solution. From the numbers I’ve seen thrown around Scaleform is pretty damn expensive (These numbers are from second hand sources so I take them with a pinch of salt)