Today, to my surprise, I received the yellow Delrin models (the Rancher and the larger Cowboy) I ordered. I'd also ordered the Ebony Rucarta models, but they're not available yet. I was expecting the order to be shipped as a whole, but they sent the yellow models on ahead (I'm not complaining

).
The thing that really surprised me (in a GOOD way) about these, is the closing snap. The pull to open the blades is firm (I'd say maybe 6 or 7, out of 10), but not too much so. Yet upon closing, the snap leaves absolutely no doubt the blade will stay closed (keep the fingers out of the way). I 'tested' it by opening the blade to progressively steeper angles, then letting go. Consistent, authoritative closing snap from just above closed position, to about 30 degrees open, after which the resistance gives way to open the blade fully. No 'slop' at all, when closed, very firm. Seems a well-engineered balance, to me. Blade centering is perfect, no play whatsoever (open or closed), and the tang-to-spring seam is smooth & flush. I noticed, every time I went to close the blade, I was automatically feeling for the lock release, as if this were a lockback. Feels like it should be; very solid when open. Feels great in the hand, smooth and warm. And I still think the color of the yellow Delrin is perfect.
Edit:
BTW, I noticed my blades are marked as 8Cr13MoV. They were listed on the site as 8Cr15MoV. No idea if that's planned for future models, but I'm liking the '13' steel anyway.