Yay. HMV are now on my list of "potentially good retailers". Wii Fit arrived yesterday.
Emailed them to ask about getting the VAT back - no high hopes on that one, but if they will do it (they should, really, since we aren't in the UK and they run HMV.co.uk from Guernsey) then they will be placed somewhere just under Amazon on my favourites list.
It's actually very cool. I'll raise the same issue that many people have - part of the "Wii Fit Age" calculation is based on BMI, and the goals are focussed around achieving an "Ideal" BMI of ~22.
This is fine for a lot of people, but in some cases (e.g. mine, where I am working out in the gym to build up muscle bulk), BMI is an incredibly inaccurate measure - muscle weighs more than fat, so if anything, my BMI is likely to increase as I continue working out.
That said, the focus on centre of gravity and balance is excellent, and its a very well thought out game/program. The board is a pretty neat bit of kit, too.