If anyone's interested here are my thoughts on the in-ear B&O H3 ANC's.
Very simply, much better than the Sennheiser CX880i I have (I did buy them in 2011 and perhaps not performing to specification, if you get my meaning). The 880i's are a little bass heavy, which for in-ears, I like very much which used pretty exclusively with my iPhone 6S+. I suppose I can do better than that but for me it's all about convenience.
Sound wise, I find them very good. Well balanced from top to bottom and natural sounding. There's more detail than I'm used to but I not a super clinical listener to am happy to put them on enjoy. The extra ANC electronics are a bit of a pain but I think I'll get used the additional bulk. Bulk probably isn't the right word, it's just a little unweildy.
The party trick (ANC) works well. I mowed the lawns this morning before it got too hot (32 outside in the shade right now) using them with and without the ANC. When it's on and without music playing it's surprising how the sound of the mower reduces. With music playing it's really nice to hear the details come through when it's mayhem outside. Best of all I didn't perceive any impact on the quality with ANC on, my original concern.
Recommended and good value at £90.
Can I ask what's the recommended iPhone app to play higher bit rate music?
Jay