I can't speak for the 350, but on the 400 it does impact on high speed stability a fair bit, makes it turn quicker of course, but also it makes chain adjustment difficult as the nature of the geometry means that correct adjustment at some points of suspension compression result in lots of slack at other points in the travel. Also, the stands are both too short for the bike's extra height.
tbh, I wouldn't bother, the only gain is better cornering turn in, I'd just stick a pair of AM26s on, that's plenty good enough cornering for me