I feel like the quantity of bass increases while the quality decreases. Maybe I'm just picky, but the texture just wasn't as good. I have the HM5 pads and although I love the comfort I think the stock pads have better sound. I still haven't gotten around to getting the ATH pleathers, maybe I should. I have the HD25 velours and I like the stock pads WAY better.
Hmm... I dont feel that it looses too much quality. Maybe a little bit of tighteness, thats all.
Good job I didin't go for the HD25 blue pleathers lol