I finally took the plunge and bought a tub-style chicken plucker.
I decided on the EZ Plucker Model 131 from CCOnly.com because it had the same 1 HP motor and 119 rubber fingers as the Featherman Pro which cost about twice as much.
I ordered the EZ Plucker over the phone on a Monday, since I was in a hurry to get it by the weekend. The fellow on the phone was VERY helpful and gave me a lot of information about cleaning the unit, renting it, how often the fingers would need to be replaced, what size birds it could handle, proper scalding, and other matters.
The unit arrived right on time the following Friday. The packaging was intact, so I signed for it and unwrapped it later in the day. The rim of the tub was dented, so I sent an email to that effect and got no reply that day (or ever!)
The unit worked unbelievably well. I put in 2 chickens at a time, and in 13 to 15 seconds, they were absolutely clean - no more than a few tail feathers left. There was no need for secondary "cleaning up" at the sink -- did not need to singe either. It saved me so much time, I kept whooping and hollering like a lunatic every time I shut the thing off and saw the birds. They were absolute perfection. Out of 24 birds, none had any broken wings or legs. One had torn skin, which I assume was due to slight over scalding. Luckily, the dent had no effect on the performance of the unit.
I subsequently emailed CCOnly to let them know how well the unit worked - I was 100% happy with it and did not expect any "refund" or action on their part because of the dent -- and still got no reply.
The unit cost $530 and shipping was another $120. I'm totally in love with it. My best advice is that these things are well built and work flawlessly, just be absolutely sure there is no damage before signing for it from the shipper.