U-Mix DJ Set Headphones

Just wondering what the sound quality and isolation is like on the headphones included in the U-Mix DJ Set?
The earpads have gone on my Sony MDR-V700DJ's and I'm thinking of picking up a set of the Mixvibes headphones to use as the backup pair to my Sennheiser HD25's, rather than replacing the pads on the Sony's (which have taken a bit of a hammering, although they might be the only pair ever not to have the joints break on them!).
The earpads have gone on my Sony MDR-V700DJ's and I'm thinking of picking up a set of the Mixvibes headphones to use as the backup pair to my Sennheiser HD25's, rather than replacing the pads on the Sony's (which have taken a bit of a hammering, although they might be the only pair ever not to have the joints break on them!).