There are incredibly few reviews of the Roland headphone line. Here are some of the ones I've found.
Roland RH-50 (~$50):
"Simply put these are one of the most balance, flat response headphones i own bar my Stax SR-001 MKII headphones. The sound is so well balanced Bass, mid and treble, all are working together. None of them are trying to steal the show. These are not drum and bass, big bangs and crashes gaming headphones, use these if you want to get away from the usual name in commercial headphones. In fact after listening to these, you'll quickly realize how tainted other commercial headphones are. Just try a pair." - Amazon Review
"He's wearing some highly underrated headphones tbh. Highly underrated. Roland RH50 are fantastic for the cash tbh, much better than Sony 7506 / V6." - Other Head-Fi thread
"The irony of the situation is, the RH-50 are somewhat like the "toy K-240 Studio" the K-81 thread suggested the K-81 are. Slightly elevated midrange, polite, unexaggerated, but powerful bass, clear spatial detail. They're cheaper than the K-81 (the "-50" index is the suggested price). So they fill the role the K-81 was supposed to get - "street", cheaper K-240-like headphones. Of course they don't have the detail and resolution of recabled K-240 Studio, but they're more efficient, and can work ampless with a portable player." - Head-Fi
Roland RH-300 (~$160):
A Japanese review rated this headphone 4/5 for SQ, which is very good on his scale for a sub-$300 headphone.
"So in conclusion, I believe that RH-300 is worth the extra money over M50 if balanced sound is your priority. RH-300 takes all of the strengths of M50 and eliminates most of its weaknesses. In fact, I have yet to hear a closed dynamic driver headphone in this price range that is a better all arounder than the RH-300. Shure SRH840 is pretty close, but compared to RH-300 it sounds a bit too dark and mellow and certainly needs an amp, whereas RH-300 will sound great even out of weak portables and built-in soundcards." (This reviewer noted later that the sound gained a warmer, perhaps darker tonality after burn-in) - Head-Fi
"These are the best studio phones I've ever used. Reluctantly, I purchased these without any other reviews, but my skepticism was immediately proven wrong. These Phones are the best I've ever used, owned, listened to etc. The price is pretty step, but you definitely get what you pay for. The sound is impeccable, Roland has outdone itself on this one, the comfort is outstanding, for anyone with large earlobes these are the phones, lightweight, listen for hours withouy dicomfort. Back to the sound. For studio work these perform magnificiently, every nuiance shows itself without any boost, couldn't tell any distortion when cranked up a little loud(although no need for the boost). Plus the recovery rate for a large number of fast tempo instruments is none existent. Thank You Roland for a fine piece of hardware" - Musicians Friend
Roland RH-200 (~$110):
"These are comparable to my dt 770's as far as sound quality goes, but as far as build quality, the fake leather and cheap plastic would be where they lack. Otherwise for the price, they are very accurate with a nice low end" - Musicians Friend
(There are many complaints about the build quality of this one so I won't stress this.)
Roland RH-D20 (~$160) and D30 (~$250):
...CAN'T FIND A REAL REVIEW!
Roland RH-A30 (~$210)
...NO REVIEWS!! (what an awesome-looking headphone, though!)
Am I missing something here? Head-Fi threads about these headphones die out quickly, and I wouldn't be surprised if this one does too. But despite the fact that the RH-50 and RH-300 get pretty good reviews, they are rarely mentioned here. Are there really so little people who have ever listened to these headphones? Is it because Roland has some shady past or taboo that we boycott their headphone line? XD
Please, anyone who has these headphones, give your impressions!! If you don't have them, at least bump this thread so people will start buying them XP
I might buy a pair of RH-300 and see for myself.