I have very good experience with the Sinar Vario (old) and Zoom 2 (new)holders. Film flatness is good and spacing consistent. I find it a great advantage to have all formats from 6x4.5 up to 6x12 cm in one holder. The Zoom 2 model offers the possibility of format change in mid roll. The Vario model can only be set before loading. One caveat: be very carefull with them. Especially the flimsy plastic lever to change between loading and shooting mode is very easily broken off when you don't do things right. Read that manual! if you buy one... When you operate them with a gentle touch and in the way Sinar prescribes you will, in my experience, have an excellent holder that will serve you for a long time.