Don't have experience of that particular model, but we have Aerons in various sizes in the office and despite being admittedly comfortable to spend 8-10 hours on, personally I don't think they are worth anywhere near the money being asked. Don't get me wrong, they are competent office chairs and I don't suffer sitting on them five days a week, but in terms of reliability and quality of build, if Argos chairs are £30, IKEA chairs are £90 and Staples chairs are £120, then Henry Miller products shouldn't cost more than £250-300. They are two, three times better, but not 10 times better.
If our office chairs are anything to go by in my experience, all Henry Millers we had, after short while became noisy and all of them now creak to a degree. Some creak like hell. Armrests never stay in place/hold weight for more than few hours no matter how hard you lock them. Additional edge mounted headrests are terrible and cheap in design and come apart. Some chairs developed slight wobble. Some angles in seat mechanisms in several chairs locked up after just two years. Plastic structural element of the seat in one of the XL's broke and collapsed with razor sharp edge protruding through the net material.
Eye of beholder and all, as much as I appreciate industrial design, I find all Henry Miller products particularly fugly and derrivative of 1970ies brutalism. Most of them wouldn't look out of place in one of those American Horror Story asylum torture chambers, but I can't imagine any of then visually improving anyone's 21st century home.