I don't normally go for these types of "gimmicky" things, but ….
My wonderful and amazing Mom got me this for Christmas, so I thought I'd give it a try.
Normally for burgers, I use lean ground beef, and then I add a bunch of "stuff" for added flavour.
This time I decided to use medium ground beef. Just a little S&P sprinkled on each side. Nothing else.
Made 1 half pounder, and 2 one-third pounders.
When using ground meat, I prefer to let things "set-up" in the fridge for a number of hours. In this case, about 5 hours.
On to a pre-heated grill. Some direct, and some indirect.
I am very impressed with this item. Uniform patties …. Might take a bit of time, but no more than forming with one's hands. Easy clean-up.
I recommend it. And, no, I have no affiliation with this product. Here is their website.
https://www.kitchenart.com/ProductDetails.asp?ProductCode=18000