I don't really notice much difference between the feel of the LBRs and the feel of standard 6" inch revolvers. You have some extra weight and air resistance (if that makes sense) from the increased barrel length.
Most people particularly object to the brace that's fitted to Taurus revolvers, but grip and clothing can work around the brace and help offset some of the weight.
Even if you could forget the legal issues involved about overall length: wouldn't the 12 inch barrels make the LBR's too muzzle-heavy, without the counterweight and bracing ability of the brace?
UBC's Police Pistol Manager
"Nasty, noisy things, revolvers, Count. Better stick to air-guns." Sherlock Holmes, The Adventure of the Mazarin Stone