Freeborn cycles in Horsham did it for me. It is absolutely the best mod I have made to any bike, ever. There isn’t a single downside - I was nervy about BB height or something unforeseen. Needn’t have worried.
the pluses- better on switchbacks (by far) , easier to shift body weight, improved attack position. But there is something harder to quantify that works- it’s like the bike just loves it .
anyway I Am blown away by it ?