Slightly deeper as well; http://graphs.headphone.com/graphCompare.php?graphType=0&graphID=353&graphID=393&scale=30
It's not about the bass quantity, I don't like headphone with huge amount of bass but the Grado's tight bass impressed me
I wish i could enjoy bass heavy music with the Grados. My MA900 does the job very well though.
Overrated: Depends on the person, gear, too many variables, but the HD598 is overrated. Also, and this is just me, I think the ATH ES9A is verry overrated.
Underrated: No headphones are underrated ime. Some may not get as much attention, but they don't get bad reviews.
Too funny...I guess those graphs explain what I heard when I bought my SR60s instead of the 125s or 80s. They really are a great value.
Overrated - I must say (many will dissagree with me as it seems) beyerdynamics is really overrated, maybe not so expensive, but I see so many say good things about it but I really can't listen to them. They feel so flat for me compared with my q701 and hd650. I don't think I will ever enjoy a beyerdynamics phone.
Underrated - Well I would say akg q701. I got both hd650 and q701 and the akg is probably just as good as the hd650 :) They shine at a bit different stuff but still amazing phones for the price. Also listened to many Ultrasones and even the expensive ones can't even compete with the q701 imo.
Overrated: Audio-Technica ATH-M50(harsh and didn't sound very good), Beyerdynamic DT 880(wasn't impressed with them, sounded inferior to the DT 990 in basically every way to me, noticeably harsher sounding in the treble than the DT 990), and Sennheiser Momentum(sounded pretty good but wasn't that good, it's overly praised and too expensive)
Underrated: AKG K240 Studio/MKII, Beyerdynamic DT 990, and Sony MDR-MA900
Over-rated: Definitely the M50, AD700's and anything AKG K/Q70X, just awful sounding headphones. Possibly the HE-500 and LCD2's as well.
Under-rated: This is a hard one, possibly anything vintage Stax (excluding the electrets), people need to be exposed to these more.
I find them a bit too big for portable use and their comfort is meh. The best thing they have going for them considering their price is their looks and build. I think the Momentum On-ear is the better choice out of the two, especially for portable use. Of the two, it's the one I would go for not only because it's much cheaper, but because it's smaller form factor and is much more comfortable while sounding comparable if a bit different in terms of sound quality.