Hey denn,
I am not familiar with what the Power Commanders do so I can't speak on how a flash will improve over what it is doing. It is my understanding that the PCs can either learn what your bike needs or you can flash, but not sure how they work together. Plenty of smarter people on here that can clarify that for me. It is hard to compare a flash to a tune because the flash is a tuners best guess as to what your bike needs versus tuning your bike directly. I think Nels has a lot of experience and does both well. The first dyno sheet is what my bike was doing with yoshi slips and Nels flash, then Nels took the time to map and tune an extra 7hp and 7ftlb over and above what his flash. The bike was a lot smoother and felt more powerful with his flash. With his tune it got even better. The second sheet is after I swapped the slips for a full 4-1 Hindle exhaust and did the pair block offs. Nels was able to do more fuel mapping and get another 8hp and 2ftlb.
This is my personal opinion without time sheets to back it up. The bike is better in all areas of the riding envelope. It is smoother, quicker and faster. It instills confidence in a way that enables me to ride better.
And you couldn't beat the grin off my face with a bat after every ride I take.
So there is my opinion. I'm sold.
Dave