I probably owned 4 over the years. A 50AE, two 45 Win Mag. and a 45 ACP. The 45 ACP and one of the WM's had ten inch barrels. On the big WM I also had a muzzle break (factory original), a cocking handle and an aimpoint. Not much recoil in that thing.
The 50 AE would eject with such force that sometimes I had to PULL the spent brass out of the woodwork at the shooting range.
All were reliable. Because they aren't gas operated you can use cast bullets. I'd recommend them, particularly the 50 if you want a REAL handful.
Unlike other big automatics, like the Wildey (which doesn't work) or the Dessert Eagle (which doesn't work well), these guns did work.