400 pounds is still high 600 aus $$, why would you risk it for another 50-100 on a bat you can't feel? plus you support aussie jobs. And for the record GM bats are pressed quite hard.
Of course it's your choice but if you're doing it only to save a few bucks it's not a very well informed one. The Watson bats are softer than most of their stock bats for the record, big profiled high middled bats.
I've found GM's top be pretty hit or miss. Either an amazing bat that flies and looks great or looks great but isn't a great performer. The profiles look nice and the grain looks good, however sometimes they don't 'go'. If I were you, I'd go and have a look and knock a ball up on one rather than importing it.
I may have one arriving in a day or too thanks to Mr Stig, I will let you know how it goes...!