The thing I don't like about the 18x20 pattern is mainly in serving. My serve seems to be much less effective in that my flat serve have less pace, and less bite on my heavy spin serves that turn my serve from a weapon to much more average. That seems to more than negate the more consistent volleys I am able to hit.
Also, my balls don't have the dip on ground strokes that I get from my BB11 mids. I have hit with a Melbourne before and it seemed very similar to my standard BB11's.
Head Trisys 250 - Pacific Tough Gut 16L/Topspin Cyberflash
Volkl C10 Pro - Pacific Tough Gut 16L/Genesis Black Magic