I bought an OCD for one of my customers that has a Compak F8 since it tends to dump a mound of coffee in the middle of the basket. I *beleive* it is helping. This particular restaurant has a ton of people using the espresso machine and trying to keep everyone trained is challenging.
Then I got some of the cheap knock-offs with 3 vanes (from eBay) and sadly I can't say the OCD was better. Haven't tried the chisel.
For grins I tried using the grooming tools without tamping afterwards. I weigh each dose out and still got some inconsistent results doing things this way.
What works every time for me is the Lyn Weber Shaker. I'm using the HG-1 but it will work with any grinder. Sadly, it's a bit much to ask of a retail establishment, which is why I gave that restaurant an OCD and not the shaker. Still, at home you have time to use it.
Hadn't used the Primo, looks very nice. Also looks very expensive.
Oh, the Barista Hustle guys were experimenting with a tool (more from distribution vs leveling) that uses needles. That looks promising.