I have an unfortunate experience to share regarding these TMA-1 Young Guru's:
First, the good: I got them late October and loved them immediately. Coming from the original, first gen TMA-1's, this was a HUGE improvement. They are extremely comfortable (the memory foam earpads make all the difference), the red coiled cable has a premium feel to it, they are very lightweight compared to other TMA-1's. I agree that the mid-bass and sub-bass are a little bit lacking, but for recording (ie making beats) or monitoring sound on set (ie shooting movies) this was absolutely marvelous. I heard things in my on-set recordings that I would not have with my standard on-set mdr-v6's, and the isolation I get in my bedroom studio is the best I've ever experienced (though, full disclosure, i'm new to the head-fi world)
now, the bad: a little over a week into owning them I sat down at my desk and put them on as normal. I went to adjust the earcups to make them a little bigger and suddenly 'SNAP, SNAP' both slider pins snapped right off! The little plastic nubs fell out of the earcup and now the earcups wont stay in place and wobble around. Very disappointing for many reasons (i've owned the original TMA1's for 3 years and marvel at their durability, these young guru's are clearly not as rugged). My heart sank because I am about a week away from deadline on a project I'm finishing up and these are my only headphones at the moment (ie I couldnt send them out for replacement because I couldn't be without headphones for a week right now). But, I was reassured that I'd be dealing with AIAIAI who is normally very good with their customer service. But not this time. They took over 2 days just to get back to me with a very curt and short response saying "we will send you new slider pins, they will be there in a week." Huh? I have to wait a week to fix them myself? Besides, considering where they broke, I don't see how i could fix them myself without fully taking them apart - I'm not opposed to DIY, but for a brand new pair of headphones this is kind of ridiculous. I wrote back and they took another 4 days to reply, this time asking me pay for shipping to send them back to Denmark for them to fix....something I told them wouldnt be possible. I wanted them to send a new pair at which point I would return my broken pair. But getting them to reply let alone address my request is like pulling teeth.
I think I may just return them to amazon because dealing with AIAIAI has been such an ********* headache. You would think a small company would want to retain their loyal customers with excellent customer service, but this has not been the case. It's very frustrating and I think AIAIAI is very close to losing me as a customer.