I bought aquaguard xpert Ro at Rs19500 6 months back.This is the best water purifier I can say surely .Its having Ro+ Uv+ Tdscontroller.There is a display panel on its body where the current Tds of water is visible .The best part of this machine is its having Tds regulator that enables us to change water sweetness level .very Tasty water .no complains till yet .its having autoflush facility .so there is no tension of calling service person to clean membranes .u just need to put the machine autoflush mode n wait for half hour and the machine becomes clean .i will suggest everyone to use this machine.