Review (5/5): In all fairness....
I got these quickly and they are great...yes they are only slightly , almost imperceivably, thinner than the Konad plates, maybe it's not so much the thickness as the type of stainess steel they use..Konad's seem to be slightly more rigid, less apt to bend or dent the plate, but both brands of plates should be cared for and used gently, it can happen to either brand. Maybe they have improved their processess but I didn't find the edges overly sharp or ragged, after all they are a thin piece of metal like the top of an aluminum can and it's true, it's possible, you could cut yourself on the plates but it's not a toy and it's more like a craft or makeup item and not intended for kids to handle carelessly. You wouldn't want a toddler getting into glue or nail polish remover type of products either.
As far as transferring the images goes I have only experimented a bit so far but had good luck. Just like the Konad plates there is a bit of practice and skill involved in applying the right motion and pressure to both the scraped imaged on the plate, to pick it up, and rolling it on your nail to transfer it to your nail nicely. Smearing of highly detailed images or skips in the image happens when not enough, or too much pressure is applied in both the plate and the nail stamping operations. Yes, work quickly for best results, yes, try different polishes, some work much better than others.
As far as using the Bundlemonster plates their aforementioned, perhaps lesser quality, stainless steel makes them slightly more flexible. I found you couldn't get a clean scrape when the plate was set on top of a mere double paper towel thickness on a table surface. The image would be smeary because you didn't get all the excess polish off the image due to a very slight flex in the plate on the slightly poofy paper towels (this would be a huge problem on a regular cloth towel) and the plate . Maybe the plate holder would help but I found holding the plate down flat with your other hand while making the scrape does the trick. Also using an old cutting board or some kind of more solid surface would keep the plate absolutely flat for the scrape. Also the metal scaper, doesn't flex at all so it doesn't follow the slight flexing of the plate when you scrape. Try using a credit card or one of those really thin plastic rewards card from a store that will flex into the image as you scrape it. These slight adjustments to use the Bundlemonster plates, even though they are a bit lesser quality than the Konad, will transfer the more detailed images without smearing.