This update majorly impacted our site.
We are in the home improvement domain. Site is 4 years old. We use only white-hat techniques. Other web masters in our niche do give us sitewide links (but these are not paid for nor reciprocated - we market our pages as value-add for their readers). We consistently ranked in the first page for a wide variety of terms. We got totally hosed. Even pages that had no inbound site-wide links got hosed in the rankings. We used to rank close to the top for terms related to hardwood flooring where we have some of the best content available on the web, now we're either at the bottom of page 1 or on page 2. It is super discouraging, after spending so much time developing content and "doing things right" - not resorting to paid links, not selling links, etc etc etc. I feel incredibly demoralized right now.