Interesting, can you elaborate on the issues with the T962?
in T962/962A there is no hot air curculation, no pre-heater on bottom side, so it does have
early IR ovens issues like "burned devices in the middle and not soldered elsewhere".
When you add 1-2 IR lamps on bottom side and/or hot air circulation you can definitely use
it even for ROHS BGA soldering (i'm using such tuned-up T962 for prototypes, max 484 balls).
Generally spoken all IR ovens are bit tricky, therefore don't expect wonder from a cheap chinese product.
I've tested the Elector oven, it was the same piece of crap (sorry Elector - expensive piece of crap)
as well the T962A (bigger is not always better - too large "cold" zones).
Btw, many ppl opening window or using big industiral fan outside to blow away the toxic air (!!!),
this is a however really bad idea. I do have special room for that, with no random cold air circulation,
therefore all the random issues are reduced to zero.