I had a 929 with a Two Brothers High Mount. I had to lose the rear pegs because the can came right along the subframe and was very close to my aftermarket signals.
Fitment - Good fitment, went together pretty easy, system was fairly light but the can was a bit heavy (not stocker heavy, just not light). The weld were OK not the finish of an Arata or a Akra but decent.
Quality - The quality was not bad.. I put mine together for about $500 with using a very slightly used C2 Straight can and used 2 Bros Header from Ebay and a brand new high mount midpipe from 2Bros.. The cans are universal so it fit with ease.
Power - Good Power in the high Rpm range.. Midrange felt a little weaker but I did not have a custom map.. Low end was hampered a bit .. I felt I loss a bit down low..Maybe a custom map would have made a difference.. I don;t know.
Sound - Good sound.. Little louder then stock at idle and she would scream up top.
Summary - Not a bad system.. Looked good and got compliments when I was out. For the money I spent it was a good full system. I would not pay $700 or so for a new full 2 bros system.
I took off the 2 Brothers and went with Hindle highmount. Cost me around $670 shipped. Better performance than the 2 Bros especially down low and midrange.. The bike is definitely LOUDER. The bike screams up top and have gotten ALOT of compliments with the Hindle.
If I had to do it all over again, I would have gone straight for the Hindle high mount.. make all the power of an Akra, Arata or Sato with a price of less than $770 to your door.
Hope this brief synopsis helped a little..
Take care and get whatever full system moves you!