I like the Beyer 770-Ms quite a bit. I picked up a pair a couple weeks ago and they are super for attenuating unwanted noise - but they fit really tight, which makes them uncomfortable to wear for long periods. I use them when I am tracking drums to keep the drum bleed down in the monitor mix and they work very well for that. My all time favourite phones are ATH-M50's and I would say the Beyers are comparable sound wise (a little darker but everything is still quite audible), but blow the AT's out of the water for isolation. I have not tried the EI or Telefunkens, but have used many other 'studio grade' headphones and the beyers are up among the best. I would say they should not disappoint.