Hey Jon,
I've had a few in the past.....like not watching the kettle when it's at 211 degrees, or overfilling the HLT

Overall they were my fault.
The recirculation stopped once after I stirred the mash...but I opened the valve a bit and it blasted out the little grain bit that got stuck in the auto sparge....just need to watch out for that at the beginning.
Other then that , no issues.....it really works nicely.
One wish is a float switch in the boil kettle for the sparge to let me know when it's close to being done.
Another would be nice for the HLT with a solenoid switch on the water pipe to auto fill it.
...though it's not to high on priority.
BCS has been a little bit of a pain regarding connection....but it's on a wireless system, so I think something is causing interference .... Just have to figure out what (may be a pump).
How has your BCS been treating you?