I heard the DT 990 Pro 250Ohm version. The mids are actually not bad on the 770 for me. I also have the HD 25-1 II which is more neutral just not as comfortable for longer sessions, and lacks the sound stage of the 770. That's the first I heard of this DT 150. Looks really old school (70's) but looks to be built like a tank. I do prefer the comfort of velour also though.
Ah, I didn't like the DT 990 Pro on anything but tubes, the treble irritated me regardless. I found the 600 ohm more to my liking. I never found the DT 770 too bad, but I prefer the DT 150. It's not the most popular headphone, but it's been around over 20 years, the original design comes from the 60s though. Pleather pads are a mixed bag, agreed. I prefer velour myself.