I use mine every time i use my chiller. I find that some beers benefit from chillers and that those beers also suit the flavour / aroma that the hop rocket gives, if i gotta clean the chiller might as well clean the rocket too, plus it filters out crud that may block the chiller.
Probably 1/4 of my beers use the chiller/ rocket.
Typically i use 2 g/ l so in my case 45 g. Have used double that twice and worked well. Have also used pellets in it a bit. Normally wrap them up in a bit of voile from my biab days, usually with some flowers to help filter. Have also double bagged with rice hulls first then pellets in seperate bag. Was suprised at the shitty rice hull tea the first time i boiled them to sanatise so i now try not to use them or boil, empty water and reboil and rinse.
Cheers
sean