The I-2 valve is a pretty good valve on my opinion. The one trouble that'll kick your butt around the block is the up level adjuster.
Intermittent entrapments, LOO's and erratic up leveling are some common characteristics of a clogged leveler.
The danger here is the valve will sometimes respond to adjustment changes while you're there, but bite you a short time later. Get yourself a 6 pack of them with o-rings.
