>>1558910More or less same as Rohloff. Rohloff has just over 600%. 600% is about the minimum when you drive steep (>15%) hills on a bike with tent, cooking stuff etc.
UK has many >25% hills, so it can be useful depending on the country.
>>1559892Rubbish. The internal hubgear is mounted in the middle of the wheel. Therefore it doesn't store a lot of rotational energy. This only holds true for tires and rims. They store roughly 4 times as much rotational energy as every other gram.
Still, Rohloff hub is very heavy.
>>1559896I'm driving a Rohlof and it feels way more robust than a derailer that has gone without maintenance for some time. Still, it can break down of course.
The main doubt I have about the Pinion is that the gears are before the chain in the drivetrain. Meaning that cycling in a low gear puts a very high strain on your chain. I'd be afraid to wear it down quickly. It is countered somewhat by having relative large chainwheels, but that makes the chain make more rounds in light gears, also adding to wear and friction.
And, of course, it's price is ridiculous.
A friend has one, and it does feel smoother than my Rohloff. But not as smooth as a derailer.