With reference to melomaniacs comments:
I have emailed Head-Direct for a replacement\refund - so I will soon find out how good the customer service is.
A big gripe for me is the fact that I was charged another £15 by UPS before they would hand it over to me - I think Head-Direct need to either factor that into the price or give the option of an alternate delivery method.
I assume if I get a replacement, I will be charged another £15 by UPS?
As for the buzzing, its now got so bad, that I just cant use it any longer.
Maybe, I have just been unlucky, if others have not had a similar issue?
Allowing for the fact that my initial impressions were clouded by my faulty IEMs and ignoring the buzzing, I have found the sound to be very similar to my S9 but somehow nicer. There is something in the sound which I cant quite put my finger on. I just seem to enjoy my music more through the HM-601 than my S9...but only just.
The difference, although not huge, is enough to make me favour the HM-601 over the S9 with my T1s (Not so much with my SE530s). I am not sure exactly what it is, but I feel that the HM-601 sound is richer\lusher\warmer and that it pushes my T1s harder and the sound they exude (now they are fixed) is just more sublime.
I havent really had a chance to try my Pro900 with the HM-601, and with the current buzzing unit, I wont be able to. If I decide to go for a replacement, I will spend more time with the Pro900s' and see how they work out.
My overall impressions so far are, that the HM-601 has the potential to be a fantastic unit if only its shortfalls could be addressed; such as the buzzing, battery life and hit and miss support of SDHC cards(of which I have to say, I love the ability to be able to swap my music on a whim via SDHC cards)
If you ignore all those things, for the price range, you are getting a great sounding unit.
My advice is that if you are happy with your current player, are not using high end IEMs and are not planning on driving Cans...wait for them to release the HM-601 mark II.