I was a bit skeptical when I first bought this and placed it in a raised bed, then when I added 250 red worms I thought they'd crawl away and be the end of that. Well winter has come and gone and when I went out and stirred up the bin I was amazed at all the happy red worms wiggling with joy amongst the veggie scraps. So nice to know they are doing their work and staying close to home - a very good investment indeed.