Hello, what is your take on the interchangeable needle sets? I'm finding myself contantly running to the store for different size circulars and dp's. I've been reading reviews on the sets and am just a little leary about investing in them if problems arise. I was reading about the Addi Click. Anyone have them? Can I purchase the Addi individually? I like making hats and find the 16" circ. needles my most used ones. Love love love dp's also. Thank you so much for any input before I take the plunge. I may have to take my birthday money and keep saving up as the sets are pretty pricey. I figure it's so worth saving for because knitting keeps me sane!!!