don't have them yet, but a must have in my mind.
As for big money 3-gun setups... I don't see why. I understand the high ammo cost, but not expensive gun costs. A good shooter is like a good driver. It doesn't matter what you drive, You're going to be fast. Same goes with guns. Someone who practices enough can put a 45 in a clay at 50 yards with a $500 1911 or a $5000 1911.
My Ar build will cost me $50 more then what I can sell my factory ar for. Yes, with LBC receivers and Black Rain Ord internals for<$850.
The shotty will cost me $400 complete
The 1911 is $550
Then a couple $20 45 mags, a couple $30 packs of 3 30 round ar mags and $600 worth of ammo and I'm all set. lol. I'm in no hurry to get it done.