I just pulled off a PureOne PL25288, date code F07J24C1 (July 24 2017 I believe, fresh when I bought it) from my LS2 motor because it had a bad startup valve clatter. The filter was on for about 4 months/2500 mi and the engine has been clattering on startup the whole time. I replaced it with a Fram Racing HP5 (without changing the oil), and after one more start, no more clattering whatsoever. Apparently the ADBV was not sealing on the P1. The Fram keeps the oil up in the engine. No more Purolators for me. I had a Fram fail on me waaay back in the dark ages (i.e. the 80s) and so had been leery of them, but it looks the quality is there now, at least on the premium ones.
This also disproves the theory that a filter run vertically with the opening at the top doesn't need an ADBV. Although the filter itself won't drain, the oil still runs back through it from the engine galleries above, emptying them.
I haven't cut it open; I don't have a good tool to do it easily without wrecking it. Perhaps someone could suggest one that's not ridiculously expensive.