All tablets have eReader capabilities - as does any portable device with a screen. The PlayBook is a tablet (albeit somewhat crippled) - Kobo considers the Vox a reader with extra capability, as do Amazon with the Fire and B&N with the nook Tablet.
Given the screen was my biggest factor with the reader, the PB fell off the radar, especially at its regular price. ThE move was about two months too late for me, and probably more so in the US with the Fire and nook Tablet. Especially as the Vox runs apps I already own and the PB can't, nor did the prices in the BB App store appeal to me.
At least the new price is right.
. I didn't even intend to buy the Vox to start, but after seeing the screen in action....