My problem with the Hero is the Sense UI. Sure, it's super pretty and I was sooo close to getting one, but then I realised that any OS updates would first have to go through HTC to have the Sense UI updated as well. If HTC ever decide to stop supporting the Hero, you would be left stuck with whatever the last OS they could be bothered to update. There's no worry about that for me with the N1.
Anyway, according to Vodafone it'll be available in the UK in "a few short weeks" (oh yes, not long weeks or even regular length ones, but SHORT!), so I'm happy to wait til then for UK-based prices. And by then there will be more "real user" reviews, plus some solid evidence on whether VAT will be charged when importing from the US.
But seriously. Any more than 2 weeks and I'll just snap and buy it from the US site. I'm actually reading the manual right now to prepare me for what I'm hoping will be the ultimate phone experience (but just about anything could hit that mark for me, I still have my trusty 3.5 year old Samsung D900i!)