Three of my pages have dropped from the first page to page 4, 8 and 13. The long tails for them have tanked as well.
The annoying thing about it is that these are updated every few months or so with new content. A site that is basically just a list of Amazon links has been catapulted up to position 2 on page 1. Also, one of the sites that has taken over the rankings for my page was last updated in October 2016 with a lot of out of date content and products that you can't buy anymore (unless you want to go down the second hand route).
To be honest, this update is pretty fucked up and it has seriously wrecked the rankings of my three best pages for that particular site.
If Google are trying to push through an update that will really help the end users, why use a fucking list of Amazon links on one result on page 1 and use an outdated article on page 1 as well. Fucking stupid! Of course, this is probably an elaborate plan for them to get more adwords revenue.