Hi,
For the people who want to know about the m50 vs hd25: the www.headfonia.com closed can shootout also contains a section about the hd25 in comparisont o the m50. You will have to search for the review though because it was posted beginning of august.
A friend of mine has the hd25-1 (my old one actually). In the past this was my favourite portable can and it is still the king of portability, sturdiness and sound isolation. IF sound isolation is th emost important for you gofor the hd25 or alternatively the akg k181dj.
I compared the m50 and the hd25-1 briefly last week when i visited my friend. TO ME the m50 is more comfortable, although the hd25 sits more securely on the head and blocks out more noise.
I prefer the sound of the m50 because it has a wider soundstage, a broader frequency response, not as much emphasis on the bass and just sounds mor eopen. The hd25 has imho a bit rolled of fhighs and at times a too much emphasis on the bass. I have not tried recabling it and this comparison was done on a home stereo.
For me, if i just olook at sound and comfort the m50 is the winner. it also isolates reasonably well and folds up to a reasonable bundle, as soon as i do something about that cable.
Greetings, Anouk,