Over the years I have seen alot of teh gnomon series and recently got access to the XSI production series, the words too good to be true don't apply, they are pretty much an essential piece of kit I think for anyone new to XSI
there is I think nearly 30 hours of veiwing (which I haven't gotten close to finishing yet). but definatley are worth the next to nothing price.
On a lighter side, you should see XSI 5.0, OMG its just awesome and the gigapolygon core is just amazing (desperatly waiting for it to start shipping). so many new and wicked tools.
Cheers
Waz