Could also get the M5 brakes but opted to wait because:
So far they not have been properly tested on road bikes. think that looking at the design, cable clamps and brakepad mounts could have some initial problems.
I do advice you too to wait (know that's hard). Think that paying a high price for the first "heavy" production run of these M5 brakes just is madness.
I decided to wait since I refuse to pay and act as a testpilot for this new product (can tell you how this works, since I was one of the first owners of a set of cat brakes)
I basically agree but even if you wait you are still a test pilot. The quantities involved in the weight weenie part industry are not large enough to yield a valid statistical estimation of the true road worthiness without waiting years to get the true failure rate rather than an estimate from a small sample.
Obviously if 100% fail in the first few months something is [almost] certainly wrong but even if only 1 or 2/100 fail the first year it doesn't necessarily mean it's any good. You may get a more user friendly design if you wait but regardless of the short term results it may still wind up a user friendly piece of crap as the infinite variety of real world variables take their toll.
Which is all a long way of saying you're a chicken who's more afraid of careening off a cliff and dying than having the newest coolest bike parts around. Well some of us have our priorities straight!