A good start - needs flexibility
With so many apps in this space it's hard to stand out from the pack. GS does a nice job with a very Mac-like, uncluttered, appealing approach. If you haven't, it's worth a test drive. I like the "Arrange" feature for it's simplified approach to window sets. Quickly, I can have one main window filling the left-hand side of my screen and two smaller windows dividing the right-hand side. Think Mail on the left and two finder windows for attachments on the right. Less elegant is making sure I get the left-hand side filled with the application I want -- the application open when you engage GS becomes the first in a list of windows to be arranged. I suppose this makes sense, but I'd still like a little more flexibility. I'd like to choose which app goes into which window.
Still a good app. YMMV window management is an individual taste.