A followup after 14 months of use:
In short, very happy with the clear-pro, but can't say whether or not it is much better than regular sand filter.
I purchased and installed the Tagalus 60D w/ Clear-pro in July 2011. Found that a friend of a friend had a contractors license, and was able to get one through him at "wholesale" (installer price), which was not a whole lot cheaper ($60 less?) than was the lowest internet retail sites plus shipping, as I remember.
Anyway, my old filter was smaller, and the sand was very old and dirty. The new (larger) 60/clearPro system, with new sand, CERTAINLY filters faster, and clearer, and at lower filter pressure than the old one did. Just can't say how much is due to clear-pro, and how much is due to the larger bed of new sand. Filter pressure is 10 psi after backwash, with a 3/4 HP pump, after 14 months of use. Still, very clear water!