I had never heard of this problem. I use Suntour freewheels on all my vintage bikes (even the otherwise all-European ones) and they've always served me very well, although I never had a ProCompe either. But last year I got an NOS ProCompe on Ebay and just started using it. Should I be worried?
George Otis
The OK Corral
a.k.a. Tepic, Nayarit, Mexico
(but great biking weather just the same...)