Shakers kitchen chimney is really a quality product, even I am using Shakers Classic model from last two n half years, though it’s not an auto clean chimney at all, but it is a completely hassle free product.
It has a terrific look with glass finish and it performing well, I would say their first year free service was satisfactory, as it is a maintenance free chimney.
I have not opted for AMC or paid service and moreover they are providing life time warranty on motor, hence I would suggest if you plan to buy kitchen chimney then go for Shakers, hope it will fulfill your expectations.