The hm5 pads are highly recommended to all NH owner I think. They give the NH a very different and more brighter signature which I also like. I had to tame the highs a little with 1 or 2 plies of toilet paper, thats my taste just. The iBasso PT1 pads can be ordered via Ibasso HP http://www.ibasso.com/cp_xq_dy.php?id=7855#page1 they are priced attractive with just 25 usd and better made than dekonis I recently had. Soundwise its a perfect and imho even better alternative to the stock AQ hybrid pads. And... they are so easy to install. You do not have to make holes in backside of the pads. The edge on the back of the pads is so small that the ring fits inside without beeing blocked by the 4 prongs of the ring.