Much better than a standard Yo actually. It has been discussed at length elsewhere, but in short, a Yo had a really steep head angle (71 deg) compared to todays bikes which made it twitchy as hell. Fitting a longer fork has softened the head angle to a more contempory angle of 69deg when sagged (which was the head angle of the standard Fat Chance in 1990- a bike considered by many to be more trail friendly than the racy Yo). Couple this with a relativly short stem and a Judy DH crown (which has a different offset and rake to the standard SID crown, or indeed the BOI inch fork) and you have a fine handling bike. The extra half inch of BB clearance has been a real boon too.
Fitting longer forks can be a disaster on some bikes but with some basic engineering and math it can transform a bike.
