The unit works well.  Our first one lasted over ten years before the glass top cracked.  We replaced it two years ago but that unit had an internal fault and kept kicking off the circuit breaker every few weeks after a year or so and then at about two years of age it stopped working all together.  The third unit is working fine but its only been a few weeks since installation.  I replaced it the third time as we are moving and it was a simple drop-in in our granite countertop.