Its not just an upgrade to a td-20. its like a complete replacement. everything sounds so much more realistic and the feel is everything I could have wished for and more. all of the subtleties come out now and my drumming sounds much much better. Sure the price hurts below the belt but you can sell your old controller and you get a extra tom and cymbal. Roland deserves a huge round of applause. The system make edrums feel and sound like the real thing. Thanks Roland and Merry Christmas!