I was reading up on these things yesterday. The new BOSS RC-2 ($189) has some drum grooves built in, that would be an awesome feature to have. The Jam-Man or the RC20XL don't have that as far as I understand.

You can store your Jam-Man loops on a memory card and put them on your computer. That is cool. If you came up with a great groove you can just transfer it to your computer. Sounds easy-peasy. Spudman, can the RC-20XL do this?

The RC-2 seems really interesting, although the price for one is around the same a a used RC-20XL.