I'm considering purchasing a MF 6x6 (Hasselblad 503CW). The one that I rented last weekend had a prism and a winder with it. Although that made it more like the 35mm to which I am accustomed, I am wondering whether their utility is worth the extra bulk, fiddling, funds, etc. Do you use a prism finder or a winder? Do you find it worthwhile? Again, I deeply appreciate your taking the time and energy to respond!