yes they are fine, excellent service.of course if it doesnt work then let them know and they should sort it out again. dont stew on it and then winge to others they are no good with out returning the part to them and explaining that it doesnt work. i just know that is what some people do with business' and they dont give them a chance to resolve the problem. Betta Bikes have an excellent reputation and rewind the stators for 90% of the riders in the offroad night racing scene over here.
$200 au sounds reasonable to me. US 150 plus post both ways and exchange rate will work out more than $200 and a bit for post over here. and you know what people in the US are like with shipping charges.
Betta Bikes also made me a complete new stator with all new parts inc (except for my ignition coils which were fine) 2 new custom made light coils, custom machined stator plate, wires, hardware etc all tested and ready to go. this also included testing and invsetigation/experimental work to build what i wanted to my needs. all for a little over $500. all done via mail order no problems.