I also tested it as a possible Triage Tablet.
Here it is being used with PubMed.
The frustrating thing is I couldn’t find a way to make it download a PDF instead of displaying it. I don’t want to have to rely on a wireless connection to read a research paper.
Other than that, it worked well for this purpose.
Previously here:
Google Books PDF Test: Insignia Flex Elite
Google Books PDFs category
Best Buy’s Insignia Flex Elite iPad Mini Clone Is Almost The iFive Mini 4
Best Buy Insignia Flex Elite iPad Mini Clone: AnTuTu
Best Buy’s Secret RK3288 iPad Mini Clone: Part Three
Best Buy’s Secret RK3288 iPad Mini Clone: Part Two
Best Buy’s Secret RK3288 iPad Mini Clone
Mike Cane’s xBlog 
Like on desktops, downloading PDFs may be customizable within the browser. You may also want to try other browsers, like the excellent Dolphin.
That’s a possibility. I could find no way with Chrome and was using only that — which is sometimes the only choice on a tablet.
Tap on “Full Text links” – “PMC full Text” (Screenshot #2, in the right upper corner) – then you will be able to download the articel in different formats.
Doing what you said in Screenshot 2 gave me Screenshot 3. But I see now in 3 that there’s a Download PDF link to the left, which I missed during the test!
EDIT July 28 Update: It turns out I *did* download that PDF. It was still on the Insignia when I was at Best Buy today. It got dropped from the post because I missed uploading the screensnap for it (the screensnap was still on the Insignia today — I’ve deleted all the screensnaps that were still on that tablet).
And when you look at Screenshot #3 on the left side under “Articel Tools” you will find also a download link.
Ha, I replied saying that before I read this Comment.