I've kept a bimac for almost a year, and I've never kept any other octopus. I'm a diver, in Southern California, and it was important to me to keep local animals that I caught myself, so I needed a chiller, and only a bimac would do. However, after learning about hummelincki on Tonmo, and seeing pictures, I would get a hummelincki if I just wanted an octopus and didn't care specifically about keeping So Cal animals. It seems to me that keeping a hummelincki would be like keeping a bimac, but without the expense, and threat of equipment failure that comes with a chiller. Plus I think that a hummelincki is just a little bit more beautiful.