So far so good on my FreedomPop Liberty Tablet, my latest Tanga purchase. After 40 minutes on the phone with Liberty Pop Tech Support, we got it to function. Free 200 minutes of talk and unlimited text (via WiFi only) is hard to beat!
Tip for consumers: Generally, everything I've bought from this site has been OK. Delivery speeds leave a bit to be desired, although this particular delivery was pretty fast. Come on shipping guys - get on it!!!