I got it on that discount.
I like to have 10 or more PDFs open. Notes from different lectures and homework sheets, stuff I'm working through, and it crashes pretty much daily.
What would you say is the better Android version of a PDF annotator?
Ummm...not an annotator (since no Android device I have used ever had any form of writing capability). But I used to use Mantano (free version) to read my PDFs and it was very good.