I use these on several bikes. They are very comfy and have good flat resistance. It's true that the sidewall is somewhat thin--that's what makes them so comfortable. It's a trade off in that regard. The only flats I have ever had--and this is with NYC daily commuting duty--were tears in the sidewall. That has happened twice in the past 2 years.
I do not agree at all that they are somehow extremely slow. They're touring tires and they feel normal--even fast--for touring tires. Comparing them to racier tires is apples to oranges. And even so, I have the aforementioned Rubino pros on another bike and I don't find the Paselas significantly slower--though they are much more comfortable. In fact, I just switched to Paselas on that bike because of the vastly improved ride comfort.
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1964 JRJ (Bob Jackson), 1973 Wes Mason, 1974 Raleigh Gran Sport, 1986 Schwinn High Sierra, 2000ish Colian (Colin Laing), 2011 Dick Chafe, 2013 Velo Orange Pass Hunter