I was looking at the Zero Tolerance knives and was wondering something about the folders. Why is there such a price difference between the 0200 and the 0300 models? There is a drastic difference is why I ask and have never really looked at them to much until recently. I know that some models such as the 0300 are assisted openers but I don't understand the big difference in price from the 0300 to the 0350 in that case. Any help would be appreciated!