I love Dozier's stuff. I own 7 of them.
The prior posts have done a good job of singing the praises, which I echo ... excellent edge holding performance, good designs, and great kydex sheaths for very reasonable prices. Lots of bang divided by buck.
Let's not dance around the issue though. D2 will develop stains and small spots of rust much more readily than any of the following:
420V
440V
440C/B/A
420 anything
AUS-6/8/10
VG-10
ATS-34/154CM
12C27
...and of course Titanium and Talonite/Stellite are more stain resistant than anything listed above them in this post.
D2 isn't truly stainless, but neither is it like A2 or O1 or worse, 1095, 5160, 52100 in terms of propensity to rust. You get the idea. D2 is closer to stainless than it is to a carbon steel.
D2 has a lot of carbon, and the chrome appears to be tied up in carbide form (along with vanadium, which aid edge retention), and there isn't much free chrome left to form chromium oxide which IS the rust-resistant surface film layer of most any stainless steel.
Part of the issue w/ Dozier's knives, quite bluntly, is that his fixed blades are left with a 300-something grit finish on the hollow grinds. This is a bit coarse. This is also a concession to keep prices down. However, it leaves scratches/grooves that are deep enough to trap "stuff" that can slowly but surely induce iron oxide/rust to form. You must clean your Dozier knife after you finish using it on anything wet or acidic or bloody or basic or sappy, etc... and I find that means more than a quick swish under running water, that means hit it with soap & warm water and give it a good bath when you can. Use around saltwater? Bathe it pronto.
I have a 3" Dozier folder that appears to have a 400 something grit hollow grind finish, maybe near 500 grit, and that helps a great deal. I wish he finished all of his blades to 600 grit range, personally.
High performance + moderate price = high value... you just have to take a bit more care than with other knife steels.