Product review (4 stars): *Proper use* necessary for good experience
I have one of these stone-topped grills, but I didn't get it from Amazon. None the less, I will review this product for the sake of others considering it.

Does it brown meat? Hell yes. If you try to brown meat and fail, it's because the stone wasn't hot enough when you put the meat on. The stone has a very high heat capacity and takes a while to get searing hot, but once it's hot, it will brown if not blacken meat easily. The stone takes a minute or two to pre-heat. Make sure you thoroughly oil the stone when you pre-heat the stone. Failure to oil the stone will make food stick to it. The stone may actually have to be seasoned before use. I don't know; mine came in a box covered in Japanese text, which I can't read.

Is it easy to clean? Absolutely not. I used mine for korean barbecue. Korean marinades tend to contain sugar, fruit juices, or malt syrup. All of these ingredients will char and leave your grill topper caked with carbon. Do not wash the grill with soap; the stone is porous and is meant to be scraped clean. Soap will get into the pores and ruin the flavor of subsequent meals cooked on it. Repeated use will season the stone until it's blackened like an old cast iron pan. Rinse the cooking surface under hot water and scrub with a coarse stiff brush a few times to get the loose stuff off, then and scrape any charred junk off using either a razor blade topped scraper or a utility blade. The one biggest drawback of this thing is the difficulty of cleaning it.

If the difficulty of cleaning is not worth the extra heat retention of the stone, this product is not going to be worth it for you. If you absolutely must have convenience, get one of those nonstick coated grill toppers.

Now, I must add that if you heat your stone too quickly, it might develop cracks, so pre-heat on medium or medium-low rather than blasting it on high. Mine still works, but it had visible cracks going through it after the first use, where I foolishly heated it on full blast. The outer metal portion holds it together such that the cracks aren't really a big deal, but I imagine that after repeated use, a cracked stone might fall apart eventually.

One more thing: this device is not meant to be used on the stove top. The stoves I've tried it on don't fit well; if it doesn't fit well, it can shift around. It fits best on one of those portable butane canister fueled burners commonly sold in Asian markets. The idea is that you have this thing going at the table, and you cook your meats at the table Korean Barbecue style.