I got a set of Ginghers years ago and they came with a whetstone which is great for touching up the knife edge. I don't think you would ever need to have them sharpened.
My set came with the 8" shears, 4" and the small embroidery scissors. I love the 4" so much I bought another pair recently and I keep one pair by the machine and the other on the ironing board. I think you would love them, but definitely try the different sizes before you buy. :D