I love windowblinds and all stardock programs for that matter... Lot's of really cool stuff and it's not too much of a resource hog.
Although i've resently found that "MS Flight Sim 2004" doesn't like windows blinds and cause lot's of issues, if windowblinds isn't unloaded when playing.
BUt, overall... it's awesome and well worth the money...
I'd rather have XP + Stardock programs then Vista... to tell you the truth.