I could probably answer this question based on person experience. While I don't own the "i" series of the 225, I do own the regular or classic version. I also own a pair of SR325 headphones - also, the classic version. The SR225 headphones have received the bass mods via Bilavideo to include the holes drilled in the drivers as well as wooden cups. Prior to making my purchase of the "modified" SR225 headphones, I had my pair or SR325 headphones for a few weeks. However, as soon as the SR225s arrived and I started to play them - and, switch back and forth, the differences were quite noticeable. The SR225 is my favorite pair right now. The SR325 is getting a bit lonely just sitting there. At some point, Bilavideo will provide me with wooden liners for the pair of SR325s. I'll then post my opinions of the sound after that upgrade has been completed. If you take a pair of SR225i and add in the cost of modifications, you're still going to be below the price of a pair of RS-2i headphones. Will the modified SR225i be better than the RS-2i? I can't answer that. However, I do believe you will easily agree that the money you spent to upgrade your SR225i was a well spent investment.