I had 2 previous quotes:
New car dealer body shop: 1 week/$1,800, (Couldn't start repair until 4 weeks).
Another local body shop, 1 week/$1,500, (Couldn't start repairs until 3 weeks}.
Duffy took car in for repair in less than 1 week and finished in 3 days.
Cost was $1,200.
The 4 year old car looks like new again.
I usually don't rate a service unless extremely bad or extremely good.
This service was extremely great!!

It did not go well. There were many problems but not all the doing of Carstar. However, after all other were solved and I went to pick up the car, I found that both taillights were reinstalled without gaskets and one of them was not properly fastened. There were alignment problems with panels and taillights and a chip in the paint on fender which was not there before they did repairs. Paint workmanship was mediocre with orange peel evident. Returned car for reinstalling taillights but there will still alignment problems where the taillight was touching the fender when it should have add 1/8 or more clearance. They also scratched the paint on bumper when reinstalling and the chipped paint they repaired was dull and indented because they only dabbed some paint in it instead of filling and then coating. Also did not put clear-coat over that repair. In the meantime, there was another chip on the other fender too that I noticed. Back again to get scratches and chips repaired and the panel alignment fixed. Scheduled for 4 hours, it took them two days to fix that. In the end, the alignment is not as good as it was before the accident and the rear hatch appears to be slightly binding.
In general, their customer response was good, they were courteous and eager to make the repairs needed to get the job done right. I marked the professionalism down because they should have noticed the bad alignment and should not have replaced taillights without gaskets and missing fasteners. These items were hidden behind upholstery panels and had I not removed them to check their work it would have gone unnoticed until water started leaking in or the taillight came loose and fell out.
I think there was more damage than was noticed by insurance estimator and the body shop. First of all, the interior panel that held the taillight was bent and that was the reason for misalignment. Second, I think the car was hit hard enough to spread it apart just enough to cause other alignment problems but would need accurate measurements to determine which was not done.
There was one last thing that irritated me and was probably due to the number of times I had to return. The last time I picked up the car, it had snowed the day before. They knew I was coming to pick it up, but they didn't make any attempt to remove the snow.
I switched body shops (from Duffy's) because despite their stated and quoted hours, they closed a half hour to an hour earlier. After three attempts to see them 30 minutes or more before closing I decided to go elsewhere.
An additional note: My experiences could be unusual as the provider told me I had returned more than any other customer.