I don't have hard data on their service life. My best guess is they are excellent in that regard since they are made of high-temp metals and are welded completely. I am pretty sure that there was a misinformation campaign put out by one of their competitors that they are only recovering from as more people get experience with them. Their sound levels are not that great, but they mostly make up for it with light weight and what appears to be good durability.
The companies I listed I like because they have acceptable sound levels and are all welded and with acceptable quick mounts. If you don't want a quick mount, SWR's Omega-30 is fine. There may be others, but the ones listed I know are good.