We have a deal on PDF Expert for Mac from Readdle. You can create and edit PDFs, work with large PDFs smoothly, and it allows you to annotate PDFs, merge them, and much more. This PDF editor also has a nice list of distinctions, including being The 2015 App of the Year in the Mac App Store and Top Paid App in the Mac App Store. It’s $54.99 through our deal, 31% off retail.
Check It Out: PDF Expert 2: $54.99
I own both the iOS and Mac versions of this. Nice app. I find it to be a great program to use to annotate PDFs. When combined with the iOS version and iCloud (or other cloud service), you can start on one device, and seamlessly move to the other device.