I'd go for something tried and test as mitchy says.
I've had my miltek for about 3 years now and never once had a problem with it. Well worth the money.
Tried and Tested, BF has been around for years and makes OEM exhausts for top line cars. I've had a couple of Bike cans off them and they aren't bad. Granted they have had issues in the past but at least they seem to address them and make redesigns etc..not churn out the same old rubbish for people to keep buying.