In theory, any set of speakers can be your reference speakers; you have to get to know them and be familiar with how everything sounds on them.
I use those headphones for recording, sometimes mixing, but I master on monitors, not headphones. That's just me. I'm sure you can find better headphones out there, but they'll cost a lot more. The price you found is less than I paid for either of my two sets, and I think I got a great deal still. I've bought more expensive headphones, and have them laying within reach, but everybody here knows those (ATHM40fs) are 'mine'.

I'd say I think they are very servicable for your intent if you like working in headphones. Others here use these too, I think John (Silvertones) uses and approves of them also. Hopefully he'll chime in.
One thing I should point out; unlike most headphones these do not come with an 1/8" mini jack and adapter. It comes with 1/4" connector on the end.