First, the Bushmills are not closed, it just seems like they are, they are vented all around the inside perimeter of the cup.
Second, both my SR80i, and SR80e, and my Bushmills, are all sporting some new L-Cush, instead of their original comfies.
Third, you wrote SR80, I don't currently owned the SR80, but from what I can remember, the Bushmills would be a significant improvement. If however, you meant to write, SR80i, they would still be an an improvement, in all areas, just not as marked. And finally, if the SR80e, are the ones you had in mind, then the difference is a lot more subtle. I'd still give the Bushmills the nod, simply because it sounds a bit smoother.
As I've said before, I think that at $395, the Bushmills X have a very good price vs performance ratio. They come in a nice wooden crate, with a plexi glass front cover, plus they even throw in a nice carrying bag. Heck!, I even preferred them, to the RS1i.
But when it comes to price vs performance ratio, nothing beats the SR80e. I thought that the SR80i, but the SR80e sounds so good, it's not even funny.
However, keep in mind that the Bushmills X are a limited edition. I have heard that some Bushmills have already been sold for a profit, so who knows what they'll be worth in the future.
I have owned Grados for the last 9 years, and aside from the occasional quality control problems, you knew what you would get, when you ordered a pair.
These days however, it seams like ordering Grados, is anything but predictable. Especially the higher end models, Grado is shipping i, with e drivers, and although it's true that some people will see this as good thing, others may actually prefer the i's sound signature, what then?.
The earpads also created confusion between Head-Fi members, some were saying that there was no differences, others disagreed, and showed pictrues to back up their claim. In my opinion, both camps were right. I think that Grados simply had some of the old pads left over, and Grado being Grado, they simply shipped the first e's with what they had left of the old earpads. So, if you want to try the new earpads, it's going to cost you, and Grado earpads aren't cheap.
I'm all for improvement, but in some cases, it seems like their just throwing whatever parts they have lying around. I mean how can a pair of $1000 or so, GS1000e make it out of Grado with a 1/8'' connector?. I can't be the only one who thinks that this is unacceptable. I'd like to see how the Audeze fans would react if the company decided to ship a few LCD-2 with 1/8 terminals.
I always thought that Grado used the 1/8'' conectors on the ''portable'' models, and that the models that were more likely to be used in the home on full size rigs, got the 1/4''. I thought it made sense, but now...
As I have said before, I'm lucky enough to have a Grado dealer close to my home, so I don't run the risk of bringing home a pair on ''Frankenstein''. But for some, ordering online is their only option, and to those people, all I can say is good luck!.
By now, it may seem like I hate Grado. I don't, not yet anyway, but if they don't get their act together, they may lose a loyal customer. I have always considered myself a Grado fan, but I'm certainly not a fanboy, wich means that I'm not going to kiss their arse, if what it needs is a kick.