I've just had the clutch and a single mass (solid) flywheel conversion done on my Octavia 1.9TDI (same power train as the TDI Leon)
Worked out much cheaper to do the SMF conversion, total cost £450 all in.
And the beauty of it is that there will never again be DMF problems in the future.
Despite what some say about the SMF conversion, there is absolutely no vibration, whether at start up, idling or actually driving, and the car definately seems to pick up much better and smoother with the SMF than it ever did with the DMF. I can highly recommend the conversion, and would now never consider replacing a DMF with another DMF.
Also, remember that if you just change the clutch, and leave the flywheel alone, and then the flywheel starts playing up at some later date, it's another lot of labour charges you'll have to fork out for as the gearbox will have to come out again. Whatever you decide to do, SMF or DMF, replace the flywheel whilst the gearbox is out and everything is stripped down.
Mike