Just easier, if I had to use a 3.5mm cable I'd get one custom made and then a second as a backup and it's just one more thing to forget that completely destroys your rig, at least with this it's all 1/4 inch and I can integrate it into a pedalboard with a simple TB loop.
Anyway given it a blast, very impressed, you really don't realise how bad the irig connector is till you try one using the dock connector.
Sound is clean, nice input levels and output levels, all the fx work beautifully now, got midimorphosis working, it's great, very happy with it now, going to do this jam tonight and just go straight into the fx loop of the trace rig available and just give the ipad my best effort, but the line 6 is a game changer for me. The quality of sound seems better than the Alesis IO Dock I had as well.
Also I can confirm it's very robust as I just walked a way from my desk with the jack still plugged into the interface(iPad disconnected luckily) and pulled it all off the desk onto the floor, not even a mark.