I was thrilled when I accidentally discovered UpCodes a few months ago. Before, I had to consult either actual bound books, certain PDFs, or cumbersome online versions. One of my favorite features is that I can copy and paste without having annoying extra line breaks, paragraph marks, etc.
UpCodes has saved us a lot of time, and its search capability makes it much easier to perform a comprehensive code review of our projects. And to top it all off, the staff is extremely responsive when we have a question or request a minor update. I look forward to trying the additional features!