The Levenger ones rock. Sure they are expensive but the quality is outstanding and helps to justify the cost. I have a model made out of ballistic nylon and leather that is no longer produced. I find it to be very ridged for writing while in the hand even though mine is not full leather. Another thing is that I keep a few (5-10) extra cards in the center pocket. Not only to refill when the top one runs out but it also helps to keep it a little more rigid. Still, even with the excellent rigidity I find it comfortable in my back pocket and a sit a lot during the day. I have actually had this one for a while and it has always been a part of my GTD system. Up until a couple of months ago I used it mainly for "quick lists" like grocery lists and such. I then found it to be used more and more for a capture device as I seemed to always have it with me in my back pocket. It is easy to take it out at meetings for capture and to drop the index card into my inbox for processing. I should also note that I am using the Levenger 3x5 cards as well. Yes they are also expensive but, once again, the price is justified. They are thicker and brighter than any index card I have found on the market. It is like the difference between, well, writing on a Moleskine and writing on a 50 cent Mead notebook. Could not recommend these products more highly. Hope this helps.