When I first ordered this product I was a little skeptical. I had seem similar products at a much higher price, so I thought it must have poor quality and/or limited functionality. I was surprised on both points. The quality is kind of what I would expect. Lightweight plastic casing, but it seems durable. All the LED panels were aligned and worked. The back panel is a little flimsy, so I would suggest not exposing the unit to weather.
The functionality really surprised me. Based on the description I was expecting limited colors and effects. But that is not the case. You can set up elaborate scrolling sequences with all sorts of color wheel effects, etc. You can use any font you have on your system and there are options for character and line spacing. Lots of borders with different effects. Overall, very nice.
The software for managing the device and creating screens/programs (what they call them) was somewhat challenging. If you use the software on the included USB you will probably scratch your head for a minute. The instruction booklet (I use that term loosely) is mostly in Chinese and VERY sparse. It tells you to find the HD2020 folder and double click to open it. Well, there wasn't one on the USB. There were several file, one of which was a .tar file. I finally figured out that it must contain all the folders needed so I unzipped it and there was the HD2020 folder. Copied it to my C drive and went from there. But, if you somewhat of a computer novice and have no idea what a .tar file is, the you will be in trouble. You will definitely need a program like 7zip to extract the software. The HD2020 program can also be downloaded from www.huidu.cn/download/128.html. That might be an easier route.
There is absolutely NO help in the HD2020 program that was sent with the device. The help screen simply displays an "About" popup. So you will be on your own - or google HD2020 demos and look for Youtube videos. (I might make one myself...).
Don't use the USB method to move your screens/programs to the device. And don't use the Android app. The first is very tedious and the second has limited functionality. Use the wifi connection. It is easy to set up and makes uploading you screens/programs a snap. That way you can "edit in real time" and immediately see the changes. And the Device Settings configuration allows you to change the brightness on the fly.
So, once you get a hang of the software it's really easy to program your device. And you can make some really cool signage with this device.
Overall, I gave it 5 stars. I'm hoping it will hold up for a while and make me happy that I gave it that rating. I'm simply using it for a Halloween display so it's not like it will be getting daily use.
If you're looking for a good LED scrolling sign at a very attractive price, I say go for this one.
Janet. 
