The mods are excellent and a huge improvement. They are worth the money and the wait to have them done. Everything she does to them makes a big difference. The wire, the rebuilt front end, etc.
As far as bringing them close to the Tenor's, I would have to say that her mods bring them closer to the musicality of the Tenor's, but are still not close. The Tenor's are in a different league than anything I have ever heard.
As I stated earlier, the improvements are dramatic and if you plan on keeping the Atma-sphere's, I would urge you to get them done. I personally would prefer to have Jennifer's modified Atma-sphere's than Ralph's latest generation of amps.
Siddh: What speakers do you have?