My 2 speed shifts predictably at 11.5mph. This is with 700c wheels. If used with smaller wheels, the shift point will happen at a lower speed. It was pretty easy to get used to, as I geared it to match my two most commonly used gear ratios when riding my road bike to commute(48" low and 66" high). The 66" high gear makes for an easy ride on flats, while being low enough to allow me to ride minor inclines with ease. As far as it being enough for uphill battles, I don't have any major hills in my area. The 66 gear inch high gear works on my hills, and I can slow down to just below the shift point if I need to tackle a steep hill. I wouldn't recommend the 2 speed hub if one has lots of hills to contend with.

My bigger problem is with wind, as Okla. City is one of the windiest cities in the nation. The drop bar conversion was so I could get out of the wind.

If I had gone with an 8 speed version of my bike, the Windsor Kensington, I could've done the drop bar conversion and used a bar end shifter with the 8 speed hub. I'm happy with my current setup, as it has a clean appearance with very few visible cables.