I checked out the video on the product page and it really doesn't sound at all like a 303 in that. I then searched out a couple more videos on YouTube. And it doesn't sound like a 303 in those either. A couple of demo tracks on Soundcloud weren't much better.
It sounds like the "recreation" was based on a description of a TB-303 from a magazine. Just awful.
If you want a TB-303 emulation, spend more and get the best, AudioRealism's ABL3. Others swear by D16's Phoscyon.
Note: I'm a beta-tester for ABL3 so I may be biased.