Quick review from me; the first few days after my SERP 2.0 package was implemented, I shot into the top 30 for a hard keyword in the US & UK. A week later and I've fallen back out of the top 100 completely. A couple of my blog comment links also showed my link nowhere on the page the day after my package was completed, wouldn't normally be too worried but these were two of the PR4 links.
However, I have shot to 1 on Bing & Yahoo and stayed there, seems to be very Bing/Yahoo friendly for me lol.
Not so much luck with Google though. :/