To get really shiny shoes, you need to start with half decent shoes (I recommend eBay and genuine issue shoes - the slightly cheaper non-issue ones have toe caps that inside of 6 months become soft and flexible, destroying any mirror finish). You then apply thin layers of polish and elbow grease. Period.
The other products are snake oil that may (or may not) give a quick and easy short-lived result, but nothing permanent. I’ve seen polish burnt off or scraped back to bare leather so often it’s not funny.
If you think there is a shortcut, then I am currently talking to a Nigerian Prince about a large pile of money he needs to move and we could do with some help…
Instant shines can die a slow and painful death. None match the great level of a good work about with your normal polishing kit and a few hours of hard work!
It’s about the effort and self-discipline you carry.
I know a Flt. Sgt. that swears by it - but other people warn me to stay away from it. Personally, comparing mine and his shoes I find I have a better shine, although it takes time. And it’s weirdly satisfying watching shoes go from questionable to half decent…