Product review (5 stars): 3 YEAR UPDATE
UPDATE -- bought 3 years ago still going strong. Get more WOWs on this than anything else in house. Love the instant on/off--a pot boiling over just goes to simmer instantly with temp adjustment. Not sure if the glass on the underside is slightly bumpy for ventilation, or maybe the paint underneath makes it background grey look a little like 3D metal bevel/hash..very nice. See pic. I got this unit at exactly the time expected . I DID HAVE TO SIGN FOR IT !! The box was well strapped, but not taped shutIt was in perfect shape upon delivery.
Pros:
1 Love the color, not black, not stainless steel, just in between and amost granet-like under glass. Beautiful and Unique.
2 the glass top is completely free on all logos, and guide marks  these are all protected beneath the glass. They don't rub off--ever
3 fit with only inches to adjust where my old GE 36 electric white with electric burners, center electric griddle, and drip  catchers used to be
4 Incredibly more easy to clean !!!!  The glass is smooth on top and nothing protrudes
5 came with a 2 burner steel griddle pan that heats both ends and less heat in middle .. It is a real advantage and used a lot.
The EHHH???:
1 its Glass ??? just not sure yet about how well thats going to work--SOLVED I LOVE IT 3 YEARS LATER-REALLY VERY HEAVY DUTY
2 definite learning curve-is like cooking over a gas flame-instant heat on-instant heat off. Taking some time to get used to.--SOLVED
3 only lost one non-magnetic pan in the transition  the others that a magnet would stick to work fine--ALL BUT 1 PAN WORK FINE
4 Surprise  the cast iron pans work but, so heavy and worry about scratching or breaking glass  so far though doing fine as long as 2 hands lift/place and not dragged across the glass *I am being overcautious SOLVED, JUST LIFT TO MOVE OR TURN OFF-PUT A REGULAR QUILTED OVEN PAD UNDER IT -- MOVES JUST FINE, 2 HAND PICKUP, JUST DON'T DROP IT ON STOVETOP
The Bad
1 having to take it slow, sometimes cant, just the paranoia is a bummer, but that could be just me.  - SOLVED
2 when using multiple burners mine has a buzz when more than one is on high.  A balanced burner temp on all of the burners seems to help. It takes a little bit to find the hummless zone if using all burners on hi, another learning curve thing.- SOLVED - BUZZING JUST QUIT W/ TIME
3 tight fit leaves not a lot of room for the under vent in the back underneath to blow, but no problems yet. -- NEVER OVERHEATED 3 YEARS
------------------
 --Common Sense would dictate that pan bottoms be flat for even heating and not rough to avoid scratching induction cooktops.
--CLEANS SPILLS AND BURN MARKS EASILY-A LOT OF USE + STILL HAVEN'T USE UP LITTLE BOTTLE OF CLEANER IT CAME WITH
--Pan Test--Will my cookware Work with Induction cooktop? EASY TEST --IF A MAGNET STICKS TO BOTTOM IT WILL WORK ON ....INDUCTION COOKTOP
AFTER 3 YEARS IT JUST TOOK SOME PATIENCE--NO ISSUES NO MAINTENANCE-LOVE MORE NOW THAN EVER