We are currently in a rental, and the owners used J-Conn for some replacement and repairs. The crew started when scheduled, were respectful of property and us.
I can't attest to the work product, as I couldn't get on the roof (nor would I know what to look for!), but what I *can* speak to is how amazing the crew was. Not only did they finish the job within the day, but I truly expected some trash/nails after the job was completed. They picked up every bit of trash, located staples/nails before they left, and were so kind. I spoke with a few of the guys, and they were courteous as well as watching out for eachother in this Texas heat.
Again, I can't review the roof repair but if they're as responsible with that as they were with property, I'd highly recommend...