Is that personal experience or opinion on the T-mod. According to the article in Hot Bike (april2001) some of the modifications are explained. And why would I go to a 180 main jet when the factoy put in a 190, I think it is already lean enough.
I have no idea because I do my own, but I have heard that they work very well from others that know what they are doing.
All the professionally modified CV's work very well but the end result always depends on the person doing the final tuning on the bike.
If anyone thinks they are going to be dialed in by mail order they are dreaming. Too much difference from bike to bike.
The professionally done CV's just have more "potential" then a stock one. Wether the increased potential is worth the cost is another story, and probably would depend on the capabilities of the end user.