Product review (3 stars): Nice concept, but better packaging needed
Great concept, but a couple areas to improve.
1. The two caps shipped in a plastic bag.  When I opened the bag, both were bent.  I attempted to bend them back into shape, but could not get them to perfectly flat.  Consequently they didn't sit flat on the range.  These items should ship in better packaging that will actually protect the product.
2. The two caps both had scuff marks.  normally products with nice finishes will ship with a piece of protective plastic film, so when your new item arrives, it looks new.  These should ship with protective film to protect the finish.

Things to be aware of:
1. The finish on these is brushed aluminum.  if they will be sitting on stainless steel, they will be substantially lighter.
2. If the edge of the range is stainless steel, the magnet won't stick to it.  If it is traditional painted steel it will.
3. Keep in mind that if you have part of your range that sticks up (probably towards the back of the range), this will/may prevent the unit from sliding back all the way, which may make the front stick out unless you do some cutting/trimming.