Hi,
I have the beowulf stubbies and I'm quite impressed, the build quality is good and they sound Great, only bike I've had where people comment on how good it sounds! Only thing I would say is that they are loud even with the baffles in, my mate with his Akro GP stubby can't hear his zx9r over mine from some way back!
I'd be happy to recommend the beowulfs to anyone.
However I have read on here recently that someone has had an issue with the company and it's lifetime guarantee, or lack of! Also there is a thread on here anout the pipe werkz and they seem happy with them so I guess it's a case of what are the differences and what's best value for money?
Hope this helps and happy shopping,
Mark
PS I got my pipes through Moore Speed racing in Poole who were very helpful and managed to get me 5% discount.