Product review (2 stars): Largest burner is defective out of the box - eventually returned for refund after no resolution from GE
Three of the burners work great. I can bring 2 cups of water to a boil in about 1 minutes 20 seconds on any of the smaller burners. With the exact same pot, which has a 9" diameter magnetic base and larger than the minimum 7" required for the big burner, it takes 6 minutes to get to a boil. During that time I hear a clicking sound every few seconds which sounds like the relay turning off the element and then turning it on again.

I've tried 4 different induction compatible cookware pots on the larger burner and they all behave the same. In theory the larger element is the most powerful, but in this case is basically unusable. I'm willing to work with GE to make it work. They have until the end of January, otherwise I'm returning it for a full refund.

I had so much hope, but in hindsight I should have trusted the negative reviews. I think I'll try a Samsung next. Too bad they are almost double the cost, but perhaps there is a good reason to pay more.

UPDATE 2/9/2018: I contacted GE near the beginning of January, explained the problem to the service rep, and she said she would contact a local repair company to send someone out to take a look. Since I heard nothing from anyone since then, two weeks later I boxed it all up and returned it for a full refund. I'm very happy I bought it from Amazon because they do full refund on appliances, unlike other stores, and they also paid for the return shipment. I'm now in the market for a new Samsung NZ30M9880UB, which seems to be brand new and not yet listed with Amazon.