Chetan,
I had Tomo.
Tomo is a form of IMRT delivered somewhat differently (Rotational Arc Therapy). Like many modern IMRT systems, TOMO also uses a daily CT setup scan so it is very precise.

Since its introduction in 2004, several similar systems have been developed, the most significant being Varian and Novalis Rapid Arc. Siemens also now has a VMAT system, so all the major IMRT vendors now have a TOMO like IMRT solution.

TOMO apparently holds some patents that may still give it a slight advantage in Head and Neck, but it is most important to choose a good Cancer Center first and consider their technology second.

Although it is true that SOME of us have TOTALLY avoided long term effects of dry-mouth we also have to give a lot of credit to the team that had the expertise with advanced tools like TOMO.