You flatter me sir, but yes, I'm a big David Boye fan. For a long time now. I've talked with him only once or twice, and with his wife a few as well.
Last time we spoke he frankly told me that if it wasn't for the find of using the Cobalt in the blades, he'd not know what to do, it is just that good. I had a custom with micarta scales, now in another possesion

but from our emails he has it in his regular rotation so that's good!

I also have owned the 440C cast blades and they would take an exceptional edge. But the cobalt has a more aggressive bite to the edge. Some claim that they can't get their knives "razor" sharp, well mine are, easily shaving hair and yet, easily goes through fiberous material. Just the other night I had twisted together strands of threads from my sewing table, making a small rope about a half inch thick. I took a very sharp blade, ats-34, easily shaves hair or go through paper, but on the softer fibers of the thread, it took a little to cut through, not push cutting but sawing type cuts. Then I pulled the Boye from my pocket I've used during the day and quite quickly cut through the bundle, as I knew it would
The cobalt won't rust, ever and has no magnetic signature.
I posted a wanted to buy thread a while back and was rewarded with two replies. Taking the first in turn and passed on the second one. Funds limited me, but that person, luckily, emailed later on asking if I would still want a second one? At the time I could afford it and so took him up on that, so yep, I have two blue handled Cobalt folders, spear point blades, one called the Prophet due to it's plain opening area for your thumb and the second one having a sun with it's radiating lines out cast in the opening.
It has become what I have coined as my GTK, meaning
Go
To
Knife, as that's what I do when I need to open or cut about anything.
I have a like new William Henry Westcliff that I wanted to put up forsale, realizing that the knife I turn to was the Boye, they are just that fine a cutting machine, not a tacticle knife mind you, but if you want to cut something, just sliced up some ham as I was typing this up actually

and did an admiral job.
Another person that could tell you about David Boye would be Will York, I had a hunting knife that I bought from Will, miss that knife, as I miss most that I sell, but I don't hunt but wanted a cobalt blade so took that one, it now is also moved on to a good friend out west, where I hope he is putting it to use.
Here is a shot of the Sun folder, with a fancy fob of my own design, the bead was made by my daughter in her shop class, works great!
Blade at 3", lock back has a detent in it to help prevent you accidentally closing the knife on your hand, which Spyderco gives credit to David for his insight.
The handle, cobalt blue, has a design that aids in gripping as well as showing off what the structure of the dendritic crystals appear like under high magnification, clever use of that area I thought.
G2
edited to add;
by TomW
...Sailors will buy anything...
Hey!...I was a Sonarman Second Class! USS Ortolan ASR-22, plank owner none the less!

I remember when the Navy celebrated it's 200 anniversary, we had a poster on ship that said
"United States Navy"
"200 Years of Tradition!"
and in magic marker beneath:
'Unhampered by progress'
