I signed the log book, along with WhiteFriar, who already qualified for this challenge, in April last year. At that time I had only five icons above the 100 mark and quite some work to do. I had more events than Earthcaches at that point in time but, as anticipated, it was the Earthcaches I managed to crank up to the 3 digit position first, though at 93 I am not that far off with events either, so if you want to set "Icon 100's (x 7) Challenge - Platinum Version" it should not be that long before I qualify for that as well.
PS. Pleasingly, this is also a mini milestone, it being my 8600th cache find!