Been using this for the past 2 months. Bought it for RM1.4K
Pros:
1) Price! This is the cheapest 4K Smart TV I could find
2) The TV comes with magic remote, which is a revelation
3) It is a proper Android TV, so can install play store (most other budget smart TVs runs proprietary OS or the Web OS)
4) Decent picture and audio quality
5) Haier provides 2 years on-site warranty, and their customer service is always very responsive
Cons:
1) TV frame comes only in gold color, it may not suit everyone
2) Picture quality lacks contrast. Sony TV's picture quality is way better. But you can tweak in the settings
3) It does not detect 5GHz WiFi (not sure about other smart TVs)
4) Runs on outdated Android 4.4.4. So most of the apps are not refined, especially YouTube, IFlix and Netflix. It still works but the UI is terribly outdated. I have bought a TV box and I normally watch YouTube in this one. Netflix is fine though.
5) Accessing media files on external HDD is very slow compared to my old Sony TV
6) Cannot set auto Aspect ratio for movies on my HDD. The default aspect ratio is 16:9 but some movies look stretched. So everytime I play a movie I have to manually set the aspect ratio to auto
Overall though, I'm pretty satisfied with the purchase. But if you can stretch your budget, I would advise to buy smart TV with latest OS. At least Android 7.0.