From Jenna.

DaBella
Overall, I would take away that Dabella is a great company who is looking out for the best interests of their consumers. That being said, you are paying for it. They are not cheap compared to other options, but with the cost I can tell you that you will have peace of mind. Because they use products from GAF with GAF trained installers, all their installs are guaranteed by GAF, not just by Dabella. I doubt you're going to find another 50 year transferable warranty anywhere else for cheaper. For our particular situation we did feel their roofing system, with built in ventilation solutions, was our most cost effective option compared to a standard roofing system for which we would have had to add a significant number of additional vents in order to be up to par with current codes. Sure, we could just slap a new roof on there without adressing the ventilation issues, but we own this house and we wanted to do it right. We had a very old roof on an even older home which had moisture build up due to insufficient attic ventilation.
With regards to another aspect relating to peace of mind I felt confident they would get the job done quickly and without any shenanigans that I have heard about in my research. When it comes to the very roof over your head, you want to know it's going to get done ASAP, and not get drug out for days or weeks. We have a 2,000+ sq ft simple pitch roof which had 2 layers of old roofing on it at the time. They demo'd the old roof and got it resheeted and the new one layed down in 3 days FLAT. What I will say about this however, is that I had no idea they were coming out the day they started the work. We contracted with the company in December and weather understably delayed the scheduling of the job. Week after week I heard from them that it would start the next week, and the week after that, and the week after that, etc. Fast forward to February and I spoke to the rep the first week of the month. I was never given an install date, just that it would be the week after next most likely at the time of the call. Then all of a sudden they show up one day. No call, even that week, to me; much less the day before. Granted, it's not like they need in your house or anything, and it all worked out fine, I just expected some heads up and didn't get it.
In the end, the roof is beautiful, they got it done in record time, they cleaned up like they were never here (except for dirt debris on the ground), and I know that if I ever have an issue with their work I'll be taken care of.