I've had the unit on my SERG for a few weeks now, and have encountered zero problems so far. I used the base maps they provided, based on the configuration I provided when ordering, and it has worked well right out of the box. I have more power, by seat of the pants feel, and the engine runs cooler than before. There is less heat from the right side of the motor where that dreaded catalytic convertor was, and my oil temps are a bit lower than before. It took a few miles of riding before the unit had the fuel maps tuned perfectly, but the results are worth it. I have more power at any RPM, and it is just more ridable. It is idling at about 975, which is how the unit was programmed, but when I get a chance I'll hook it up to my laptop and reset the idle to about 850 rpm, assuming I still have good oil pressure at that idle speed. This thing was expensive, but worth the price. I vastly prefer this to any "add-on" tuner that just modifies the stock ECU base maps and requires dyno tuning. Dyno tuning is hard on bikes, and is only as good as the tuner. It is also only ideal for that unique ambient air pressure, temperature, altitude etc. The stock delphi ECU is a fixed base map through most of its operating range, and has very limited auto-tuning at higher throttle conditions only. This unit continuously auto-tunes with wide range oxygen sensors over it's entire throttle/rpm range for any barometric pressure, ambient temperature, fuel quality, altitude etc. I can even change components without retuning.
In short, I'm happy with the unit, and there isn't anything else like it on the market.