I was unlucky enough to have bought HD509N 2 weeks ago without thinking that tomorrow is Black Friday, and i just saw that they are preparing an offer for tomorrow
However, i have no regrets because i am extremely satisfied with this set top box! It runs fast, no lagging, image is clear and sound is good.
I also bought the Airmouse together with the device and it's really useful to use with the apps. Downloaded some of them and they seem to be working fine.
Installation was very easy, HDMI cable, Ethernet cable, power supply and that's it! You can use WiFi too, but the signal will be weaker than with the Ethernet.
All in all, i believe this is a great value for money and will surely recommend it to anyone who is looking for an alternative way than satellite and subscriptions to watch tv.