There is almost nothing else that can be said that hasn't already been said. It's funny that the small/just-right nature of the handles is in the hand of the be-holder. To Ethan they are perfect, to me they are too small. Corrected with liners made from .060 Kydex and they feel great to me.
The slipperyness of the Zytel was fixed by media blasting. Moose -- PM me your address and I'll send you a set to evaluate. Ya want tan or black (actually, grey after blasting!)?
I love that each model has a bigger, older brother. As others have mentioned here, you almost had to hide your original Beckers from non-knife-types or be deemed a weirdo. The Tweeners are MUCH more acceptable in mixed company.
I made up a bunch of knives for a friend's son going to Afghanistan soon as an Army MP and let him make his choice. Several Beckers were in the breifcase. He ended up chosing the KaBar MK1 because of it's carry size and weight. Now that the MK1 is DuraCoated and the Kydex sheath is 90% done, in good consciousness I'm forced to now offer the troop all three Tweeners to re-evaluate his choice! I think any of the three are the superior blade to the ancient MK1's design (heavy and short). If he chooses a Tweener I'll have to rush and make up a sheath.
[As a side note, he was told NOT to bring anything that was ACU with him. They could only attached OD green or black items to their vests, which kind of leaves out the stock sheath unless it was dyed].
I blasted the coating off of one of the BK15s yesterday (see thread on how tough that was to do), and when I was done the knife seemed SO much lighter. It must be a mental thing since the coating can't weigh anything, but it just had the feeling of being featherweight.
OK, I'm done.