I have recently bought 2 Pi's from a local reseller (Czech Republic). Both were in Raspberry Pi boxes with RS logo and so on. So I guess they were as genuine as one can get. I have had no problem with either of the Pi's.
Now, I plan to buy other one and I have found some financially interesting offers on Ebay. The Pi will be shipped from China. The offer on Ebay is $53 for Raspberry Pi 2.0 Model B + plastic case + 3x heatsinks.
At my local shop the price is $50 for Pi alone and additional $14 for case and heatsink. For $14 I can get charger, SD card and WiFi dongle at Ebay.
So the question is, is the quality of Pi's from Ebay (China) worth to risk? At local reseller I have 2 years warranty, so it's easier to resolve any issues.