Tumblers are very nice and worth the cost. They do a much better and quicker job than a plastic trash can or a 55 gal metal drum because they are double wall thermoformed with a gap for insulation (which helps keep the heat up as microbes do their thing). Heat is THE key.

Weed seeds will NOT break down, so never put any livestock waste in there. Any poo will do as long as it doesn't come from a grazing animal (dog poo works well if you don't put too much in there).

Also, take a whiz in there every once and a while. Human whiz is high in nitrogen. A few Salmon carcasses are a great addition and its a pink year, so you should easily have a good supply. Any organic matter household scraps go in there as well. Old stale bread is also good food for the microbes.

Good luck and happy gardening