Lots of shooters have had problems with the 725 triggers and often it's guys who have had tubes made or are shooting unusually light loads. This problem is often a failure to reset the trigger for the second shot and can usually be fixed with a trigger job but in some cases it takes a lot of tinkering on the triggers to get them to fire the second barrel. I've read that replacing the trigger block and and piston spring with one out of a 725 combo gun will fix the problem but I can't prove that. Also, I would say that this is not a gun you want to have tubes made for however while the bulk of the problems seem to lie with using tubes or very light loads there are lots of stories out there with guys having problems shooting normal trap loads too. Doubling, light strikes and occassionally having a very heavy pull are just some of the complaints and Browning has been known to replace complete trigger groups on customer guns. Browning has a good warranty on these guns and will take care of problems but who wants to deal with the hastle of having problems, then sending the gun away not knowing when it will come back or if it will come back in one piece.
Browning advertised the 725 as having mechanical triggers but they aren't true mechanical triggers becuase they still rely on inertia to reset the second trigger... they're sort of a bastardized afair. The part I can't figure out is why Browning decided to change what was a fairly sound design despite inconsistent trigger pulls and trigger take up and change it to a design which has been generally unreliable since day one! Lets face it, Browning has never been know for it's great shotgun triggers so I think they should have focused on making the old Citori trigger better. There has been at least one redesign of the 725 triggers since the guns came out so newer guns should be fine but the early models with the first generation triggers could still cause problems.