I have the T-962 oven and my impression is that you get what you pay for. It does serviceable work for small PCB’s, but you should not expect consistent heat towards the front and back extremes of the heating surface due to the positioning of the IR tubes across the center of the oven.
It also gives off pretty bad fumes when running. I had to relocate it to a small bathroom with an exhaust fan to avoid getting a sore throat.
When the cool-down fan comes on, it exhausts the hot air through vents on the bottom of the unit. This will make the surface it sits on very hot and could damage or burn that surface. In my case, I used a layer of fiberglass batting and a sheet of steel over the surface to avoid heat damage.
And then there is the embedded firmware…
*The keypad is not debounced, meaning that sometimes you have to quickly stab the buttons to get it to work.
*The control loop is just bang-bang rather than PID, resulting in quite a bit of temperature variation.
*The heat turns off if the actual temp is within 5 degrees C of the set point, so it is always a little cooler than it should be.
*The fan turns off if it is within 10 degrees of the set point, leading to big temperature swings in the cooling off phase.
*The data shown on the LCD graph appears to be fudged, since the “Actual” points are always higher than the “desired”, in spite of the numeric readouts which suggest the opposite.
*The designer of the user interface appears to have gone out of their way to make things counter-intuitive (e.g. a button on the left moves the cursor to the right).
This would be a much more usable machine with different firmware. Perhaps this could be an interesting open-source hacking project.