I've had both the Thor 4 and the Thor 5. Neither one lit up well when turning my wrist to read the time. Both lasted no more than a year with very light use. While they worked, they both worked with my Cricket Wireless SIM card flawlessly. Would like to try the Thor 6 but the customer service is very difficult to access since it is via Aliexpress (long distance with the barriers that ensue).
The relatively unknown Chinese manufacturer Zeblaze has introduced the Thor 6, a new smartwatch which is actually more of a smartphone considering its specifications. For example, instead of a purpose built smartwatch processor the manufacturer decided to go with the Helio P22 made by MediaTek.