Virtually every 1911 with a barrel 4" or shorter will have a bushingless, bull barrel.
Adding some weight to the muzzle end of the gun for balance, and to perhaps delay unlocking slightly, are the benefits.
Disassembly is different, but I don't know if it's really better or worse than a bushing gun.
I like to be able to adjust the fit of the muzzle via a bushing, but if you wear-out the fit of a bull barrel, it might be time for a new barrel, anyway.