Are you worried about the durability of the hds?? Trust me those beauties are ridiculously strong, some may argue that they are ugly and the plastic looks like a plastic bin (not my opinion, behind there is a conscious choice of materials and design) but they are DURABLE! I throw them everywhere with no care at all...plus they are super light...ok but this would be nothing, the main fact is that the sound is amazing, very balanced (great equalisation) with a deep and supertight bass, one of the best isolating on-hear headphones with a clamping force suitable when you go around and move your head everywhere, they won't fall (and if you are crazy and they fall they WON'T BRAKE).
About the DT1350 I don't know because I didn't try them out yet, I bet they sound slightly better (brand new drivers and modern technology vs 20 year old stuff) but I can also bet that the dt1350 don't even approach to the hd for durability, I can already spot weak points from pictures and videos of the beyers, particularly the plastic junction of the slides and the connection with the cups. Don't get me wrong I don't mean that the beyer are fragile, no far from it, but in my opinion not as strong and durable as the hd25s. The senn look **** at the first sight but then you fall in love with them.
