I've got the BR 2 into 2 on my Deuce, and I then installed the BC Monster baffles.
Here's a couple of things to consider.
1. The Big Radius 2 into 2 will not help performance at all, period. If you are doing this for looks or sound, fine. But if performance is a priority, go with something else that's a 2 into 1.
2. The stock V&H baffles are considerably louder than the stock exhaust. Not obnoxious, but you do have to take it easy if you're sliding in the neighborhood at 3:00am. The BC Monster Baffles are deeper and louder yet, to the point it's actually too loud and I've avoided many later night treks through the neighborhood as a result. Sounds great, but long rides require ear plugs. As a matter of fact, they pretty sound like straight pipes.
3. Supposedly the BC Monsters will give you a boost in HP/TQ. I haven't had mine dyno'd and a new custom tune made yet, but I have no doubt they might help a little - probably no more than 5 HP/TQ. That said, I personally do not think the BC Quite Baffles are worth considering. While I have no idea how they compare sound-wise to the stock pipes or the standard V&H baffles, if you just look at them, you have to know they are going to cost you performance-wise, over the stock exhaust and the stock V&H.
That all said, if perfromance is your priority, don't bother with the BR 2 into 2. If you don't mind perhaps taking a little hit, and want a great looking set of pipes, and can tolerate a nicer, but somewhat louder sound, go with them, but don't waste your dough on the QC's if they are too loud. If you want to be obnoxious, and turn heads everywhere you go, get the Monster Baffles. Either way, you will definitely want to get a custom tune as mine was running way lean with the stock program.
Lastly, I would think you should be able to run into someone running these pipes at a poker run or rally. I see them all the time? Hearing pipe in person helps alot!