I am humming and harring about importing one now. If I have this right, for a 32gb iPad with Apple case, via bundlebox priority shipping it's £584 (including US sales tax at approx 8%) + £50 if you have to use bundlebox's buy for me option (increasingly likely judging by reports of cancelled orders from UK debit/credit cards) which comes out at £634. Have I got that right?
If you take the formula of Apple's UK prices (add 24% to the US price) the 32gb iPad with case comes out at around £500.
Have I got that totally wrong?? If not then you are paying a premium to get it from the US, rather than saving money.
I think regardless of the price, The majority who are importing them is to have them before the UK release. Who knows what the UK pricing will be. I guess all you can do is speculate