Thank you everyone for your replies, you've all been a massive help! In terms of responding to questions: - I don't think a top three would be attainable, my usual calibre of questioning is "what does this button/dial/slider do", so I think item-related questions would make it obvious I'm gift...

First post - sorry if this is in the wrong place! I know absolutely nothing about music/sound/audio, but I'm looking to buy some headphones as a birthday gift for my partner, he mentioned liking the dt990s at one point so I was going to get those. They would be used for recording and mixing...