To actually answer your question, no, I don't have one and never heard of it until your post.
That looks interesting to me and it would be fun to play around with. There was a time when I would have bought that without a second's thought. Today, I am still tempted, but I am trying to quit blowing money on stuff I don't need; just because it looks interesting.
I hope you buy one and report back to us how you made out with it.
FWIW: I am not sure why they chose to use bullets that light ?????
Edit: Now that I read a little bit about it, and watched the videos, I do remember seeing this at some point in the past. I watched a YouTube video awhile ago where a guy was reloading .22LR but he didn't give any details as to REALLY how it was done. One big question I had was where do you get the bullets ? I also didn't know what they were using for powder or how much. The only thing he talked about in the video I watched way back when was how to prime the cases. Once you posted about this kit and I Googled it, all my questions were answered. It seems like it would be a very tedious process, but it would be cool to do IMO. Some people like to do things just for the heck of it, or to say we have done it. I am one of those people. I also like to try all kinds of weird and oddball stuff now and then. I have done the thing with nail gun blanks, shooting air gun pellets with primed .223 cases, multiple projectile loads, shotshells .......................... I have plenty of ammunition but at the end of the day, I still never loaded a .22LR case and it would be cool to do so, again, IMO