<p>I've had good results with my V700 and 120 using betterscanning.com 120 holder and ANG glass. The combination holds the film flat, unlike the Epson holder, and allows "infinite" height adjustment via little screws. A fiddly job, but when finished the scans are sharp corner to corner.<br>
Some of my 35mm screens have been excellent, some not. If the film has a lengthwise curl there are problems..... I should probably get ANG strips for those holders, too.</p>