I have SPB Shell 3D. I love it.
However, the 3D doesn't work. Not sure what the heck they're talking about claiming it's stereoscopic 3D, but it is not. It's listed in the experimental section, which claims it is for features that aren't yet ready for prime time, so hopefully they fix it someday.
I can't see any stereoscopic 3D at all, and when I slide to a different panel, I then see the top layer slide first and the bottom layer gets dragged behind it, one red and one blue or green or something. That probably makes no sense but if you ever see it you'll know what I mean.
I turned off the stereoscopic 3D feature because it sucks. But the launcher itself is way better than Sense, and I run it and would recommend it to anyone. $15 is high, I agree, but the product is top notch.