100% the case, I only purchase original Grado pads. As
@Gippy states, major differences with aftermarket G cushions. Compare to a Grado G pad and they pretty much all fall short. Listen for yourself to know.
Pretty much agree with one exception: Beautiful Audio pads.
I hated the L-pads as they hurt my right ear, for some reason.
The knock off G-cush are very comfortable, but sounded weird.
I bought the Shipibo's which I don't care for. They are stiff enough that they keep the drivers too far from my ears. And they cost a lot more than the G-Cush pads. If you are looking at the Shipibo, just spend a bit more and get the BA pads.
The G-cush pads look like crap. They look like B-model pads. If I had paid $2.5K (in Canadian bucks) and got a GS/PS headphone with these pads, I would have been less than impressed.
They are very stiff and keep the drivers away from your ears, but not as badly as the Shipibo's. However the headphones will fall off my head very easily as there is no tight fit. And I have bent the headband repeatedly.
The sound does seem "bigger" as the sound kind of bounces around in the big cup. And it does reduce bass noticeably. After comparing the Hemp's with the G-Cush against the GH2's with BA pads, for a short time, my initial reactions are: The GH2 combo sounds deeper and bassier. The Hemp's sounded more open and had more high end. That was both out of a Violectric V220. With this setup, the GH2's needed just a touch more volume to even up.
Just for giggles I plugged the Hemp combo into my iFi Pro iCAN with a jolt of bass boost. Very nice!
Just as a last note, when I used the F-pads for a few hours they started to hurt my ear. Kind of like the L-Cush used to, but more of the ear?
Just my Grado rambling as I am in the middle of a Grado week that includes two headphones, three sets of pads and four amps.