more than a year with the milltek now and it's fine. they had problems with the welds in the past, I asked them about this and there was a bad batch. anyway, the guys who experienced problems got their parts replaced under warranty, so customer service is spot on. it sounds the way you want to and the tail pipes look good
Having said that if money were no problem I'd buy a BTB or a yozza which are a bit more expensive.
BTB because I like the way the bends in the pipework are made
yozza because obviously it's the best rated here.
Between the BTB and the yozza the BTB will sound deeper if that's what you're after
OR if I'd be a billionaire I'd get an orbisound for abot 1k
(don't know if they're still available)