I've never purchased one of these so I am not sure about the build quality but I am seriously considering getting one as a slim client for a HTPC setup.
I've been waiting for a Dual Core 4.1 tablet with 1GB of RAM and HDMI to come out for a while now and this seems like a great price. As a bonus it also has a SD card slot (max 32GB) and a USB host port (USB OTG), making it perfect for a media center.
There is a really Comparison with the Google Nexus 7 on the page for those interested.
I've copied some of the important details here, but there is more information in the link.
CPU Type: Cortex-A9
CPU Manufacturer: Rockchip
CPU Model: RK3066
CPU Clock Speed: 1.6GHz
RAM: 1GB
Capacity: 16GB
Display: 1280x800 IPS
GPU: Mali400
very good price for the specs.