Chessmaster Grandmaster

Doing a spot of shopping last week and I spied "Chessmaster Grandmaster" on the shelves in one of the computer game shops I frequent. I few months ago I had a bit of a rave about "Chessmaster X", which I regard as excellent value for $20 it currently costs. But at this stage I can't say much about "Chessmaster Grandmaster" as I haven't seen it in operation. (Despite being a widely read blog, no one sends me free chess stuff)
I've seen a couple of reviews, but even they've been a bit sparse. It looks as though it follows the same formula as Chessmaster X, with a whole lot of fancy chess sets and settings, and has the same emphasis on teaching chess, and not just playing.
Probably the big difference from Chessmaster X is the multi-platform support, with both the PC and Nintendo DS versions on the shelves. I believe there will also be X-Box versions available as well, although I haven't seen any for the Australian zone.
At this stage I would suggest it may be a good purchase for the DS, but the extra cost for the PC version (over Chessmaster X) may not be worth it.