I can chime in on this. I have one and agree that it sounds good, right amount or gurgle and pop….but. I purchased a resonator version last year, I thought the blue tip would look god on my Persian blue car, and the obvious weight loss over original exhaust is a must. Received and installed only to find that the tip was misaligned, it was off clockwise to horizontal level, the way it is constructed you can only adjust the tip up and down.
I contacted them and after waiting two months they did send a replacement tip, waiting for weather to cooperate to replace the tip as I was also planning a brake/clutch fluid flush at the same time. well time finally came and as a lot of other posts state the brake/clutch fluid was horrific, especially for car having only 5K on it, anyway back on topic, the replacement tip they sent after I waited two months ( maybe an indication they do not do it in house) I found to be even worse than the original as far as tip alignment! I returned their replacement and stuck with the original, its off enough that people notice which is embarrassing, as soon as I can I am taking it to get corrected at an exhaust shop or welder.
I am no engineer but I did grow up in a muffler shop, I have no idea why they would hard weld the tip to a pipe that has 4 or 5 bends in it? of course it would be hard to get the tip angle correct and each one would be a little different? If they just left the tip as a slip on it would alleviate the issue with alignment. Like the exhaust sound, quality? Well that’s a different story.