I did the sportive version a few years ago, and would definitely recommend it. The pro race was on the Saturday so we rode out and caught that a couple of times, including the top of the Ghisallo after we rode up it ahead of the race (being cheered on by thousands of tifosi as we did so).
Then on the Sunday we rode the fondo version, less crowds but amazing roads.
I did the sportive version a few years ago, and would definitely recommend it. The pro race was on the Saturday so we rode out and caught that a couple of times, including the top of the Ghisallo after we rode up it ahead of the race (being cheered on by thousands of tifosi as we did so).
Then on the Sunday we rode the fondo version, less crowds but amazing roads.