I ran IDPA BUG matches for years in Minnesota. I ran them as an additional match in addition to our regular Summer league matches. Probably 1/2 of the regular match shooters also shot the BUG match. A few of the regular match shooters said the BUG match was the main reason they came to the match. At least one more club in Minnesota runs regular IDPA BUG matches.
I ran 3 short (5 round) stages. My philosophy was short, quick and represent a real situation, even more so than regular IDPA stage.
I'm thinking of modifying the IDPA BUG rules for my matches. I think 3.8 inch barrel for a semi-auto is too long. I would shorten it to 3.250 or so. I do not consider my M&P 9c a BUG gun. I would allow reloads on one of the 3 stages I usually run. I would still limit magazines to 5 rounds. I know that puts the J-frame revolvers at a disadvantage but most of the revolver shooters don't care about the disadvantage, they just want the practice reloading under the clock.
I allow pocket holsters. Just remove the holster from the pocket before re-holstering. I want to make the matches as close to what guys carry every day.