For a while, I went down to the Compact Size, which has the same page height and 6-ring layout as Filofax's Personal size, but a greater page width. It's an interesting size, proportioned more like an A5 sheet, but more portable. If the Personal's narrow page makes you feel cramped, you might like Franklin's Compact better. Franklin's also comes in bigger ring sizes than Filofax offers, which lets you carry many more pages!
Of course, these factors also make the Compact less portable than the Personal. I can toss the Personal into almost any bag I own, and not feel it's cumbersome. Carrying a Compact, although it's smaller than an A5, still feels like carrying a "big book" to me. Closed, it measures 6.25" (16 cm) wide, 7.5" (19 cm) tall, and it has 1.25" (inside diameter) rings.
I think I spent less time with the Compact than any other model or size because of this worst-of-both-worlds feeling it gave me. But I did—and still do—love this binder. Nice forest green leather (green's a hard color to find), and it feels and smells great.
You can't see it in the picture, but it has the Franklin Quest imprint—from before the acquisition of Stephen Covey's productivity training business.