I have both the Paselas (TG folding in 28mm) and the Challenge PRs. The Paselas have been to L'Eroica (Gaiole), the Retroronde (twice) and many vacation trips. They're really light (which adds more to the riding experience than I expected) and I've yet to get my first flat (knock on wood). In terms of usability they get an A+. They only thing that could be improved IMO is the look of the rather prominent treads. Yet they're on my fresh build for Gaiole 2015:
The Challenge PRs are currently on one of my touring bikes, a Gazelle Champion Mondial semi-race. I like the look (even though the decals are a little in-your-face) and the ride, but as my previous experience with Challenge tyres was not so good (Grifo XS, >1 flat per day, due to the tyre shifting on the rim under heavy downhill braking) I'm not about to use them in important (hilly) events yet.