With regards to dirt/grime accumulating in the pivot area, it's really no different be it KVT or washers. It may "slow" the action down a little, but it won't compromise the function. The knife will still open and close just fine. It just might not be as smooth as when it is clean and freshly oiled. The "fix" is the same in either case - just flush it out with hot, soapy water, dry it out, and oil if needed. Between my KVT and flat washer knives, the rate of accumulation of crud in the pivot is about the same, so I wouldn't say either one has a maintenance advantage.
Damn, not bad. It would make a nice option at the least. How has the coating on your black wash blades held up compared to the DLC on your 0301?
Here's a video another forum member did of his 0561 (with KVT) submerged in a bucket of muddy water:
http://www.bladeforums.com/forums/showthread.php/949197-ZT0561-Mudbucket!!!!!
But back to your main topic... I have a 0301, and I like it a lot. It's probably still the most comfortable knife in hand of all the ones I have. The wide and contoured handle really fits the hand well. As for the blackwash finish, I really like how it looks on my Skyline and Blur. I haven't seen it in person on a 0300, but the pictures I have seen look great.