Had mine a month or so. Know what you mean about the uninspiring noise. Installed a GPR deeptone exhaust last weekend. Good price, fits well & I think it really suits the bike. Comes with 2 removable silencers. I've actually kept them both in & the sound is spot on to my ears. Nice to have the option to go louder though!
Would highly recommend. Their website has a good video for fitting instructions