3under isn't for everyone. there are things to consider. it may not be as forgiving a release at the inception, and it may take awhile to "perfect". if your 3under release isn't "right", it can be a clanky, noisy affair as well, and may require rethinking arrow selection.
3under, "gun barrelling", can make for a better line-of-sight aim at shorter distances, but more difficult at longer distances as trajectories increase. 3under can be particularly good with heavy bows and fast arrows!
the snap fit of the nock is *critical* - too little snap and a release could dry fire, too much snap can cause inconsistencies in arrow speed.
3under feels better to most archers with a more upright shooting form, as opposed to canting - and severe canting with split finger may be near impossible with 3under and there is no "grip" to holding the nock with yer fingers. a more upright form may require an arrow change or modification.
i think every archer owes it to themselves to give 3under a good go - it just might be the cat's meow for ya, as it is for rik and perhaps for mudd, too! how cool is that? :cool: