If the eye relief was 2 or 3mm longer, itd be a 10. Sharp to the edge in a TV85 and C-8, and provides the maximum field for a 1.25 format in an eyepiece thats much smaller and lighter than the Pentax XL or XW - but for use with glasses, its frustrating. If you dont observe with glasses, or dont mind not seeing to the field stop (unless you move your eye around), give it a 10. After trying both, I went with the Pentax XW 20 for monocular and binoviewing use - despite the softer edge performance, I find it so much more comfortable to use than the Pan 24 that its the compromise I preferred. Note to the advisors on the Equipment forum: you were right.