This thread is making me like Mach IIIs even more, if that's possible. However I will temper my love just a bit by saying that for a pitch and putt, city park course where durability and longevity is a big deal, the Mach III could be a good fit. The powder-coating they put on these is really top-notch and makes the course really 'pop'. And they add a little challenge, or character to a course that might lack challenge in elevation and/or distance.
However for a challenging course that is used for big pro events, Mach III probably isn't the best fit and I'd recommend a Mach X, or the new Mach 7 looks really cool, or any of the latest top-of-the line basket from the usual suspects. It really is course dependent, but there are situations where the Mach III is a good fit still.