I’m only replying now as I have only just seen the post!
I really like my ERA-1s, great build quality, fit and the way they sound. Yes I agree the fit is a bit odd and re hated size so best to try first. however I do find them very comfortable and can wear them for long sessions, unlike my Meze 99 Classics which I find fatiguing after a much shorter time, both comfort and sound.
Back to build quality, well I dropped mine on to a carpeted wooden sub floor from standing shoulder height and the right channel went. I was gutted and thought myself a right plonker!! On advice from a Quad dealer I rang Quad and what a wholeheartedly experience it was. No dramas, complications, what ifs or maybes. Packed them off to Quad for repair and they were back home to me in a little over 2 weeks, they actually rang me to tell me that all was sorted and they will be shipped that day. OK there was a cost £154 including postage. So in short they are a little fragile, the answer, don’t drop them!
Overall I rate them highly and can recommend them, provided they fit and you have a decent headphone amp.