I actually find that Amazon's Kindle application works pretty well. To get the content onto the app, download the Kindle app onto the touch pad, register it with Amazon to get the kindle device ID, and then use the Send To Kindle for PC
app to upload your PDFs from your local system into the cloud and onto your device.
Intel i7 4790k @ stock, Asus Z97-PRO(Wi-Fi ac), 2x8GB Crucial DDR3 1600MHz, EVGA GTX 760
Samsung 950 Pro 512GB + 2TB Western Digital Black
Dell 2408WFP and Dell 2407WFP-HC for dual-24" goodness
Windows 10 64-bit