Ended up getting the 660 which looks good, plays great and the kids love to lower for some dunk/play time. I weigh close to 200 lbs and it doesn't budge when I hang from the rim.
Heed the companies advice and get help for backboard install. My wife and I were able to do the entire install up to the point of the backboard. Had a group come over for the final step and was glad I did. Once it was up and leveled the hoop plays great.
Shipping was also above expectation as the driver was very helpful and courteous.
Can't comment on longevity. Appears to be well coated. The Minnesota winter will be a good test....