I'm sorry you've had the issue with Brownspoint as I've purchased quite a bit of stuff from them, and it always turns up promptly and at @50% of the cost of purchasing the same parts from a UK Suzuki dealer.
I do however always pay that little bit extra for the courier service rather than the US postal service, as I always want stuff NOW
However at work we are experiancing all sorts of issues with courier deliveriers from the US at the moment, items taking up to a week on express 48hr service etc, and far more delays caused by a sudden additional interest by UK Customs.
The shipments also take lots of tracking, and we've seen a couple of items scanned into a shipping box on the plane, but then not scanned off the plane this end. It's only when you chase it a couple of days later that it suddenly turns up.
Once it's in the courier system that package that's the most important thing in the world to you, and the loss could mean disaster for you or your business, is just one of thousands that the customer service guys at the courier call centre are chased for every day, and it means bugger all to them.
Oh, but I would be chasing Brownspoint constantly as they've more chance of tracking it than you have.