Wow, this is strange. I also really find them easy to fit.**
The folding versions are twice as much. It's the Pro (
http://www.vittoria.com/en/product/rubino), which also has a much higher thread count. Twice as much is still a good price. Before LEL I was going to get a folding tyre as a spare, but decided to buy two new ones instead for the same price.
Forgot to mention, these are my second Rubinos. First were replaced for the reasons above, and are waiting in the shed to be refitted when the current ones are done. I did once get a proper puncture with the first set: an enormous thorn punctured it. Oddly it did not happen on the ride, but when I got my bike for the next one, it was flat with a 1/2 cm thorn sticking out of the tyre.
** mind you, I have wrestled with the black beast that is 16" marathon pluses. That's minimum 45 minutes of angry obscenities and at least one broken tyre lever. And I kept getting punctures, so it was a dark time in my life.