My analysis is based solely on product claims easily found on each of their websites. If there is additional information on either/both, that is great to know, but it was not part of my breakdown. Update: After reading through Russ' response... I think you have to take it with a grain of salt, unless he wants to share the results of those head-to-head tests. I'm sure both units a good machines, with their pros and cons. It would be nice if someone would do a head-to-head to assess long-term value in a controlled unbiased environment.
As I mentioned earlier, I am not in the market for a machine, I have access to one already and the $100 grinding wheel entry price was more than reasonable for me. My son and I have been sharing it for the last 18+ months with great results. Well worth the price considering we've only had a handful of times his blades were damaged enough to necessitate a trip to our LHS to get it sorted by a trained professional.
As for the product page you linked to, not for the Home version, for the SkatePal. The Home machine wheels are $99.99 USD. No clue what the difference is or why 1 is more expensive for seemingly less sharpenings.
Reading through the recent responses, I saw a few issues mentioned that I haven't experienced with the Home machine I have access to. If those issues are deal breakers or something that is giving folks pause, I figured I'd mention my experience with the ProSharp. Nothing more, nothing less, I've got no skin in this game. My son and I and our extended family (3 serious players in that household) have been very happy with the results the ProSharp provides. YMMV.