Only the RH300. They were a bit disappointing to me
stock but
pad swap helped it a lot.
The RH-A30 is in the same category (did hear it and compared to HD650).
Good but not something 'special'.
So I did not buy one as they are difficult to 'unload again second hand' without an, to me, acceptable loss.
Also I don't like to buy something new (and sealed) and then after playing with it (and attempting reversibe mods sometimes) send it back leaving others with something they cannot sell as new on purpose.
As I don't use the 'every brand that sends in something, even when crappy, gets a 'glowing review' on youtube and or press ensures that they won't send samples to me. I either have to rely on owners sending in stuff (which happens) or me buying stuff or visiting a friendly dealer that lets me measure his demo models.