Received the HE-300s a couple hours ago and have to say I am really diggin' the sound. I know Hifiman's planars get all the love, but these phones deserve some.
I have listened to the HE-500 (balanced and SE) and they rocked it good. Love their sound and currently want to sell a few things to get 'em or go for the HE-4.
Once I conformed the headband to my head I was ready to roll with the 300s. Tried both pads, pleather and velour.....velour...