I prefer to use Abode PDF by default. And I also use WPS - an office software vendor in China who also releases a PDF reader, while WPS users are not required to install it to read a PDF file, WPS office has facilitated a reader in WPS, which is very convenient for most of us. From time to time, I've seen the giveaways for SodaPDF, but never give it a try. I don't quite understand what makes it a paid shareware. I mean, we can find a large number of PDF tools online, who will choose a paid shareware?  :-\