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Heh, I bought a pair of the Tefta primitif size 42 from ebay and just received them yesterday. Just have a few things to add about the different model:
I totally agree with you, they definitely fit differently. I've got M42 Classics, M42 KSO (x3), and M42 Flows to compare them to, and they're slightly more snug than the M42 Classics. I'm in between sizes for the KSOs (M41 too small, M42 a tiny bit big), so the M42 Classics and 42 Tefta are just about perfect in size. The Tefta also feel wider at the toes -- not sure if it's due to the shoe being wider, or more likely it's because the sole is stiffer.
Yeah, the sole is stiffer and probably thicker. I don't have any way of measuring the thickness, but the sole feels more like the sole of my Flows. It looks the same, it's got the siping (which in some parts, as you mentioned, didn't seem to be cut completely cleanly), but I don't feel the ground the same way as with the Classics or KSOs.
The upper material is completely different from the KSOs, too. The part that covers the same part of the foot as the Classics feels like a very thin neoprene, and the thinner mesh part seems like a more open weave than the KSOs. The straps at the heel are like the Sprints (instead of the single heel strap like in the Flows), and the strap over the foot is of a synthetic material like in the flows, just much thicker - like a faux leather. The Tefta's don't have the extra material in the uppers lying just under the strap that the KSOs have.
So basically, they look like KSOs, have the straps of the Sprint, soles of the Flow, and their own materials for the uppers.
Hard to say whether they're worth the money or not -- that will depend a lot on how durable they are. One my KSOs have had a problem with the strap, and Vibram took care of that with no hassle; obviously I don't expect that kind of customer service from an ebay vendor from Malaysia. For an extra pair of kicking-around-on-the-weekend shoes-if my-KSOs-are-drying (Flows for cold weather, KSOs x 2 for work, KSO for weekend, Classics for both), I can live with the slightly stiffer, less sensitive sole. And for $40 (total cost including shipping), I'm willing to take the chance. Crazy, though, how in the last couple of weeks, he seems to be getting/asking closer to $60 plus shipping for each pair. At that price, i would definitely be buying Vibrams instead.