Joey,
I have a few points to make regarding your inquiry:
First of all, Mezz products are really startimg to make a name for themselves in this industry. To proceed with purchasing a shaft and making arrangements to have it fitted to your Bender is not a bad investment. Point being, that if it winds up not suiting your game, you will still have a unique item which is highly marketable to the Bender-community. (provided your ring work is conservative)
Secondly, I highly vouch for Mezz. I have been loyally playing with mine since the inception of my game (roughly 5/6 years). The old timers in Chicago bread me with the mindset of putting a quality solid hitting cue in your hands and taking it to the grave. My Mezz has never paled in comparison to even the highest end of custom cues.
Additionally, I play with the stainless steel Mezz united joint. Love it. I have three shafts: An orignal standard PUJ maple, a Rick Howard custom made 13.25mm maple (hits like a mack truck!), and an old growth Joss 5/16x14 shaft.
Getting back on topic, my cue initially came with the WD700. I didn't care for the shaft diameter (12.6mm). I felt as if I was being deprived of milimeters

The shaft hit great; but just didn't suit my game. I had already been playing with thicker stiffer shafts, and was not/could not get accustomed to the LD perspective.
To describe it simply...
~High impact
~High feedback/resonance
~Consistent medium on the deflection-spectrum
Best regards,
"playonepocket"