FWIW I have very similar headphones in the Aeon Noire and HD600 and I enjoy the HD600 as much as the Noire.
Sure they don’t have the bass or the top end sparkle but their mid range focused sound really suits a lot of the music I listen to while working at my home office and to me they fill a requirement in my small collection very well.
In fact I might use them today, I have been on an IEM kick for some months.
I would suggest giving them a chance, more than 15 minutes. Set the others aside for a few days and if the HD650 doesn’t grow on you then get rid of them.
Sure they don’t have the bass or the top end sparkle but their mid range focused sound really suits a lot of the music I listen to while working at my home office and to me they fill a requirement in my small collection very well.
In fact I might use them today, I have been on an IEM kick for some months.
I would suggest giving them a chance, more than 15 minutes. Set the others aside for a few days and if the HD650 doesn’t grow on you then get rid of them.