If you are training with 00 Haught, you will be exposed to some of the finest defensive shotgun training available on the planet Earth.
One of the great thing about shotguns is that the majority of what you really need to practice with one can be accomplished with dummy shells doing dryfire. Moreso than any other platform we regularly use. You can practice getting the gun mounted, working it effectively, loading it efficiently, and then if you fire a box or two of shells a month working on your recoil mitigation then you've kept all the core skills with the weapon razor sharp.
The shotgun takes more initial knowledge to get up to speed on, but once you know what to practice it's one of the easiest weapons to maintain competency or proficiency with.
Quality shotgun training is indeed in short supply...but a few of us (Givens, Haught, and recently myself) are trying to fix that.
Given the way the political winds are blowing, I expect shotgun training to be more in demand in the near future. Which will hopefully cause more instructors to go out and learn how to teach the gauge.