Just haven't tried it yet but have been carrying it as a spare. I'll try it tomorrow I think.
Well, it works (as expected) and doesn't get hot and smell or anything after a few hour's use. I need to run the iPad down a bit to see what happens when charging the iPad. I'm not particularly motivated to do any noise tests - I'll use it at my next gig and have a listen but I don't have any problem with the stock supply anyways. I bought this solely to have a spare in case the stock one dies at a gig.