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Well! So so! By and large the system works very well aside from operator error and a design flaw.
MOSFET current throughput is dependent on the load and is less effective applied to small resistance heaters. Power transistors are probably a better choice for switching a linear supply on and off rather than pwm through a MOSFET. The effect was more dramatic than expected rendering an otherwise serviceable heater ineffective.
An alternative is the Murata switching voltage regulator, but I am not sure how resilent these are to frequent switching.
I posted an update in the cold finger thread but it has a life of its own and is swallowed up in the ongiing development discussion. I'll post here just in case there is interest in the system.
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