A magnificent pair of headphones with the added advantage of a microphone & controls that put it ahead of the HF-5's.
The audio is excellent, and the varienty of headphone covers provided ensure proper ear fitting and thus an excellent sound quality. Even better is that these headphone can have custom fit ear-moulds created for them, meaning you bin all of the funny rubber, foam and other such attachments for a pair of properly moulded in ear mounts that provide you with perfect listening. I was purchased the 'custom-fit' earmoulds as a birthday present and contacted the firm (ACS) who after signing me up informed me that although earmoulds were supposed to be £80 - £90 (I can't rememeber which) because I had been signed up I could not get them for £75 ish for the pair - this included the creation of moulds of the interior of my ears (done at my local ACS vendor, which happened to be Boots) to a full laser 3d scan of the moulds and the creation of full hypoallergenic moulds which can fit these earphones. The laser scans are apparently kept of file for at least 5 years and at any time you can order a new pair to be made up, in any of the huge variety of colours (or see through) - only trouble at the time of writing this delivery time is about 3 weeks due to a massive surge in orders due to ACS being featured in a professional drumming magazine.
Anyway back to these headphones, they arrived promptly and my only niggle which prevents them from scoring the full 5* rating is that the cable shirt/jacket clip needed to be fitted by the end user and there was no indication of where on the cable the clamp was to be fitted and nothing to make the fitting simple, so aside from that which may or may not apply to you, a truely great product which does exactly what it says and produces a really great listening experience