Did position tech's PFI to ATW, AJ and Ink. Let my previous PFI reg for a site, overrun the year by about 6 months, though they were not in the 24-48 hr crawl cycle, they were still getting the obligatory update, with ranks between 1 and 10, though have noticed a slip towards the bottom of the first page on Ink. Hence thought now its time to get back into the 24-48 hr crawl cycle for the year coming to reverse the slid.
However with the 3 engine opt-in, approx 3 * more expensive, so i included less url's this time around. However the effect has been massive, all but wiped out my entire site from the top 10 on ATW, and teoma, even the 24-48 hr crawl pages are doing far worse than when they were just left out of the PFI. Ink's turned around but on fewer urls, with all the free-bees, and past paid-inclusions, down the pan from an ROI point of view.
Something to think about, if your sites, in either of them three engines, and your ranks are not to bad, watch the PFI, my intentions, have just created a heck of alot of work for myself in reversing the negative to what should have been positive!