I personally don't have a big problem with the author's desire to make a few dollars (US$9.95, to be exact) for his efforts at delivering a remarkably faithful clone of Apple's Expose. Considering the alternatives, I think it's worth the money. So let's leave the ethical and trademark/IP infringment implications out of this discussion and look at how well WinExpose actually works, okay?
First: it installed and worked flawlessly on both computers on which I've tested it. Both machines were running XP; one is running at 1.4GHz, the other at 2 GHz. The 2GHz machine is very close in smoothness to Expose running on a Mac; the slower machine is roughly equivalent to (and maybe a little slower than) Expose running on a non-Quartz Extreme Mac. So, overall, performance is acceptable.
Features: The good: minimize all windows, app windows only and show desktop works as expected, with a configuration panel that looks a lot like the Mac's. Despite some reports I've read elsewhere, it works just fine on a dual monitor setup, at least for windows on the main monitor. Stability is good and resource usage is minimal. The bad: minimized windows don't show movies or live animations while they are minimized (big deal!), the show desktop feature seems to have a bit of extra redrawing going on, but it's not really noticeable on a reasonably fast machine. The ugly: no window title text overlay, as is so nicely implemented in Siwu's app, Iex 0.2.
So, overall, I like it.
PS. if there's another open WinExpose thread somewhere here, I apologize. I found a few before posting this, but they were all closed. I think this app deserves further discussion. It's good, and will probably get better. The programmer has already responded to one of my queries, and readily admits there are still a few shortcomings.
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