Hi Robin, well I have been ordering out of the USA for nearly 7 years and there are NO export taxes and have not been in that time, only taxes into UK (VAT) and very occasionally import tax which can be between 7-9% although never from USA on what my business entails, only ever charged it seems from NON EU member states in Europe (Switzerland is one for sure).
True on Packages marked as Gifts, I once had a charge for £64 for an item valued at £14.56, I contacted them with details and they cleared it immediately as it was their error.
I was not implying importing is cheap in general, its not unless your importing specific items, large volumes or non dutiable items (printed matter etc) but importing the wintake (the only option available should those want it as its not available to Uk market), is easily possible.
Typically items in Uk at say £100 would in USA be $100USD (at 1.5 rough conversion rate that represents a saving of £34, even add to that the VAT at 20%, still saves you 20%, a saving not to be sniffed at in these tough economic times (and dont go down the route of not helping UK economy by buying overseas lol, its our pockets at the end of the day lol).
Those not seeking out and out performance might prefer a "Loss" in power (although It's not really a loss if you never had it
) and might prefer the £65 in their pocket (Minimum £65 or possibly more depandant on price paid and duty paid!), given the fact there is less pipework and less components its also going to be easier to fit (or for those not technically minded or gifted with tools) and especcially cheaper to have fitted due to less components.