I've bought a LOT of Boogie gear from eBay both here in the UK and from the States - in fact all my Boogie gear has come from eBay. General observations are that there is a lot more gear in the States than in the UK and the prices seem to reflect that. It was cheaper for me to buy in the States and incur the transatlantic shipping costs, the import duty and the VAT than to buy in the UK. That was for my Triaxis, 20/20, and MKs. On occasions bargains do appear here, but very rarely and are still more expensive than the States. 18 months ago my Triaxis cost me $911 + $200 shipping (can’t remember how much the import duty & VAT was) but there was no way I could have bought it in the UK for that. 20/20s have appeared here and normally go for around £500 mark, in the States I’ve seen them for anything up to $600 - a third less. 20/20s are good amps to ship over here as the voltage conversion is quite straight forward.
My advice - if you're in the States DON'T consider buying from the UK, however if you are in the UK serious consider buying from the States, importing is not that difficult. Most of the US eBay auctions say they will only ship within the States or Canada, but I find that an email to the seller often works.
Ian