Funny, I just got out my two mini's a while ago to try swapping the washers between them. The Ritter has tight action and the sheepfoot a bit of play. I think i got the washers confused when swapping around scales a while ago. My guess is the Ritter takes thinner washers and that is hopefully the source of my issue.
Anyway, I took a break after finishing up some flashings in the sheet metal shop and ran into this thread before working on the knives.
This is my lot of Grips. Starting at the top is the stock Pardue shape, partially serrated wearing Igorded canvas Micarta; followed by my M390 Ritters in Wilkins coarse G10 with the sweet blood-red aluminum butt-spacers; and at the bottom my black sheepfoot pair in 154CM and Igor's random G10 pattern, which is kinda like Anso, but, well, random. The pattern (is it a pattern if it's random?) doesn't show well in this pic so I'll plug another in below to show it off even though this is a Ritter thread.
The Ritters are my favorites with that high flat grind and the M390--wicked good slicers. The sheep foot pair take a really sharp edge with their hollow grind and are great cutters. Oddly enough, the knife that gets the most carry is the top one as it's one of my hard-use, sometime work carries. It's easy to sharpen, the 154CM gets really keen, and I'm not afraid to beat it up a bit.
Too bad about the Ritter discontinuation. There are so many really good knives that BM doesn't make anymore. As other posters have mentioned, there probably comes a point in the sales arc of most models that manufacture is no longer cost effective. In this case the relationship between the parties may have influenced the decision.
Posters have also mentioned that there are a lot of Ritters out there and they should be fairly easy to obtain on the secondary market for the foreseeable future. I wonder if the secondary market itself indeed has a role in falling sales of new knives as guys move on from their purchases and there are plenty of cheaper used pieces in good condition vying with more expensive new knives. I don't mean to suggest that's a bad thing--just is what it is.