Very true HD, the Muelas do seem to have a strong Spanish feel to them. They were my first real intro to good quality knives. And I agree, the DFLE has a feel in the hand that is the perfect definition of what a Bowie should be; comfort, strength, weight, and balance are just a few of the things I like about the DFLE.
And Unsub, don't feel dumb. If I remember correctly, the knives are manufactured in Spain, but I believe their corporate HQ is in South America.
As for the Muela sheaths, I love them. I've always been a fan of leather for my knives and Muela makes their sheaths to fit each knife perfectly. All the handles and scales on their blades seem to just mold to your hand; I've only ever handled one that felt wrong, and that one was a large Bowie style blade with marble scales. It was too smooth and heavy; nice looking, but you could just imagine it slipping in your grasp doing any serious work. I think it was meant more for a display queen, anyway.
The edge Muela puts on their knives is also better than most standard edges I find come from larger companies. I've never taken the time to actually measure what the actual angle is, but from comparing it to similar knives from Spyderco, Buck, and CRKT, it is probably closer to a 20 degree angle. I find them to be very sharp, and hold an edge really well. Again, this is my own personal experience, some people may have had differing results.