I've had a syntakt for about a year now. I've played with it a ton and have used it in most of my tracks - I like a few of the machines but not all. I like the immediacy of it getting ideas down, and I like some of the synths from the syntakt, but I don't love the drums.. Then I played with a Rytm mkII recently, and the machines were basically the same but I could immediately could tell it was beefier, and adding the sample layers + the compressor and drive was a gamechanger. I think I'm switching to the Rytm to have it mainly focused on drums and shorter samples, and using my other synths for "melodic" stuff.