Jack,
I have the PM3520 and have added the swing away option. I don’t have the bed extension though. I find the swing away option to be a very useful feature, and use it often. Even for small bowls, it is nice to just get the tailstock out of the way, and not have to heave the heavy piece around.
Before getting the swing away option, it had a roll around cart that was designed to take the tailstock off the bed. It worked OK, but this is so much better.
I also have the PowerMatic outboard turning stand, and have used it a few times. It is pretty expensive, and I’m not sure the value is there for that.
Kind regards,
Rich