I love mixing using my Ultrasone Proline 750's which have been very durable and, in fact, I just broke out the spare ear pads it came with a couple months ago after more than 8 years of use!
I have a friend who absolutely hates them - to him they were just too different. Different strokes for different folks. (Of course, he is a multi-grammy winner, so I had to just agree to disagree!)
![Cool 8)](./images/smilies/icon_cool.gif)
I also use IEMs quite a lot nowadays, but that could be dicey, they have so many sound signatures. I am very used to the ones I have (Shure SE846, a 4-driver machine with a dedicated sub-driver). Yes, TOTL, and worth every penny, as I am not lucky enough to always have a quiet environment. (And I got sick of pressing the headphones against my skull with dubious results!)
My point to the OP is that once you get used to the sound of your monitors and/or headphones and know what to expect of a great mix out of those, you are well on your way.
Terry