I had a SS 12k until a few months ago. Never occurred to me to use it for a razor (too many stones around, I guess, hadn't gotten to it). I sold it because it wasn't as good for tools as the chosera - it didn't cut as fast and struggled a little with some high alloy tool steels (and for tooling purposes was otherwise not up to par with the cho and a shapton 15k pro).

The thing I like about using a stone as far up to the end as possible is that you really have a lot of control over the edge geometry, and the chosera has me doing a little more loaded strop work than I'd like to soften the edge. If i'm not careful with the softness of the edge, I have razor burn that peaks then... bad.... two days later, regardless of the shave soap or cream.