I'm guessing a lot of people were curious? I can tell you what I know about the item but I haven't personally tested it.
Aparently much of the issue with torque converter shudder has to do with the time and amount of engagement. That is why many TSB'* call for recalibrating the PCM to delay engaging the torque converter. The item in question has a dial you can turn to delay the engagement thus effectively eliminating torque converter shudder.
This has its obvious benefits as there is a 6+ page thread somewhere on here talking about just that issue. Now I'm not going to sit here and say this is a fix for everyone there, but the theory works out.
They featured it on Shade Tree Mechanic a while back and it'* been around for a while. I haven't read any complaints about it either.
Aside from that since I haven't personally tested it I really can't say much else. I'm hoping to get that and the vacuum shift improver for testing and a writeup soon. If I get more info between now and then I'll let you guys know.