I took a different route. I bought a pair of Smeggy inspired Thunderpants crafted by Marty of Martin Custom Audio aka Martypants, so I could compare and contrast the woodied T50 to the plastic one. The Martypants came with a pair of 02 pads that I test drove on my stock T50. They were nice, but I got the stock pads sounding pretty good when I applied some paxmate to the earside of the baffle around the driver. I removed the paxmate when I struggled getting my 840 pads on. I'm thinking of reapplying it and removing the foam on the 840 pads. Anyway I sold the Martypants because a stock T50 can be modded to sound just as good.IMO.
I listened to a Thunderpants in a meet a few months ago and I came away with the feeling that while they were good I didn't find them good enough to pay for it. The T50RP with some basic mods is a great bang for your buck. I'm done with the T50RP mods and won't be opening them up again.