Anyone have any experience using or facing Tight 3 Defense?

[defensewins]

I wouldn't be over amped to run this defense.  Too many issues to coach one's way out of...One formation either has a two gapping force (and contain) player [which is unsound, IMO] OR two gapping LB(s) [I'm hoping it is the latter].  Personally, I would not want to teach either...

I don't understand the need to have three players play two gaps...IMO, if a team is getting gashed running the A gaps all day and NEEDS to have three players there, it's going to be a long day no matter what defense they run...