Shooting quail. I have several .410s, and the last one I bought, the Dickinson, I ordered with fixed full and full, for doves. A 28" .410 with tubes is great for quail. You can open up the first barrel for close shots. I have to make myself slow down on the flush every now and then if I shoot quail with a full choked .410. Even a 11/16 oz. load can mess up a bird pretty bad at 10 yds.
Really, the whole deal with choke tubes is versatility. Being able to match the gun to the game at hand, quickly. Personally, I wouldn't be afraid to buy the gun just because someone had Brileys installed in it. It may or may not have been regulated before the tubes were installed, but there is a better chance they were installed to increase versatility than to correct POI, IMO.
If, you think you should own a .410, you probably should.

I'm hosting a dove shoot tomorrow in a 96 acre peanut field, and I've about decided to wade into deep water with the Dickinson and try her on these big, fast, late season doves. It will be the ultimate test of the gun. I will post the results tomorrow evening if I do indeed use it, good or bad .............. but I may not mention my shell/bird ratio.
SRH