on my ipad it works like a charm, get shredder and garageband, they both rock and transform your ipad in any set of amp+stompboxes
on osx it seems delayed and I actually got in a situation where whatever I hit on my guitar, it was about 3 seconds off, don't know yet if that's a problem with the jam or just with any digital input being processed by garageband on osx. But if you're going to use an ipad and plug that into your amp, this is the best stompbox/amp replacement you can get, $110 or so for every shredding combination out there sure beats buying stomboxes ;-)
