I have a 550, and love it!
In fact, I won a sqare deal B, and Dillon traded me full value for another 550b
NOW I HAVE 2 550's!
BTW, My production is around 350 per hour at a leisurely pace. No need to ever hurry when reloading.
Reminds me of what an old Pharmacist told me once, "Don't EVER hurry, or you'll hurry up and kill someone."
Holds true.