The Mantis ComposT-Twin is a very hardy, well-built and well-thought out compost tumbler that sells for about $499.
The Mantis ComposT-Twin has been built with two chambers, which, combined with the price, might initially put off some people who might not see the utility in having a two-chambered compost tumbler.
But having two chambers lets the compost hobbyist "cook" one batch of compost in one chamber while they can still add composting material to the other chamber. Having the cooking compost in a sealed chamber gives the composter the advantage of being able to time their compost production a bit more efficiently and resulting in the producing of more compost more often. And the less often you have to open the door to any compost tumbler, the less of a mess you're going to have to deal with - not to mention you're going to have to deal with less in the way of odor.
The Mantis ComposT-Twin is well-built, with a tubular frame that provides a good, strong base. The two chambers are fully enclosed with four aerator vents. The gear system, when combined with the easy-to-turn handle, makes for easy mixing of composting ingredients. Each chamber on the Mantis ComposT-Twin has a 10-bushel capacity.
From the manufacturer's description:
The Mantis ComposT-Twin holds almost 25 cubic feet of raw material – that's 10 bushels in each chamber! Aerator vents on each door allow oxygen into the chamber while vented end caps assure even air flow and proper drainage. Bin contents are fully enclosed to keep out rodents, pets, and other wildlife. No more messy, unsightly piles, no odors wafting over to your neighbor's porch. Two latches on each door means bin contents are more secure, and less stress on individual latches. The ComposT-Twin frame is a convenient 32” high for easy loading and unloading. The easy-crank handle and gear mechanisms make the drum easy to turn – even when fully loaded!
No mess, no smells, no unsightly bin in your backyard. Contained and elevated to deter pests. No back-breaking work to mix and aerate pile - just turn the gear-driven handle. It's easy to remove your finished compost - the Mantis ComposT-Twin sits a sensible 32 inches off of the ground.
Picking up the ComposT-Twin Cover is a good idea because it keeps your Mantis ComposT-Twin secure in just about any weather, preventing weather-related damage and just keeping your compost tumbler generally looking nice year-round. This particular cover that Mantis sells is dark green and the weather-resistant vinyl is reportedly easy to clean.