There are still some V2 versions with the delrin poppet out there. That's not abnormal. V2's were out well before the metal poppets were.
You should see a difference in reliability for one thing. Perhaps a bit more consistent as well. Since their rebuildable, it should be the last one you ever buy as well.
ETEK 3LT, with 14" Ti boomstick and cure 3 + bolt F/S
Vanguard creed eyes, membrane, bolt pin, detents F/s[/color]
Old school angel poppets/cup seals, spring detents(not sure which models) F/S