Originally was playing the E6 too much roll on greens, then the q star better, but did not like the feel off the putter.
Now I only carry one ball in my bag the Taylor Made Penta TP5, so good around the greens and I love the feel off the putter. I eventually realised that most of my wasted shots were missing putts and around the greens, so thats where the Penta comes into play for me, my green game is much more solid. While the E6 was straighter, id rather have a ball with better greenside control, more shots are saved there.