[Audioscope]

I already have the Beyerdynamic DT990 in 250 ohms.  I know Beyer makes a 600 ohm version, and I recently found a good deal for it.
 
It is worth buying the 600 ohm version?  I will be using this with a MisterX balanced M^3 amp.

 

[Trunks159]

I don't think it would make any sense to do that. Don't buy them.

 

[Audioscope]

I haven't been keeping with the times, but I remember Skylab describing them as excellent some time ago!