I really like this effect and the thoughts Cosmo has on this. I love that he's curated it so that no matter what number they name, they'll be counting at least 10+ coins. It makes for great built in suspense. And being able to do this without the bit of misdirection that other versions need is so great.
I've seen some reviews claiming this takes little to no pocket space and I want to address that - it takes up an entire pocket. I (personally) would not feel comfortable leaving anything else in the pocket with the gimmick.
The other downside I found to this is that it's VERY easy to accidentally engage the gimmick. I've worn it for 3 days straight now and do not feel comfortable performing it unless I can double check that everything is set immediately before performing. I went out of the house for 3 hours yesterday. Sitting, standing, driving, etc and by the time I got home, over half of the coins had come out of the gimmick. This could potentially be the jeans I'm wearing but I'm still experimenting with it.
The gimmick is cumbersome and will take a whole pocket but the effect is insanely powerful. As with any method in magic, there are tradeoffs and it's never going to be perfect. If this is something you could see yourself performing and you're ok with the pocket space required (AND you don't wear skinny jeans) then by all means you should definitely pick this up!