Smith and Noble!!!!
We have Hunter Douglas cellular blinds on our front picture window. It's 99" across, and we actually have 3 blinds, one large center one, and two smaller side ones.
The larger middle one ripped after about 9 years. I contacted Smith and Noble and they replaced the middle one at no charge, and offered us a very generous discount to replace the two side ones, as the colors would be off, since the two smaller ones had been in the sun, and the brand new one would not have.
I thought that was outstanding customer service.
They are a little spendy, but for that type of service, worth every penny to us.