Slightly less stable, I can turn it over with OAT if I'm not careful but a clean rip will usually produce a nice, Buzzz-like flight. I've nailed more 50'+ putts with it than any other putter so far. They hold such a tight line and stay up longer than other putters that once you get them dialed in they make you look like a pro when approaching the basket.
I like them both for different reasons. I love the softs for driving in the woods and approaches b/c it kicks less, I love the mediums for putting and driving b/c it's stiffer and feels more consistent. Needless to say I rock a Soft and a Medium in my bag.