I had a OTmkI for a couple years, sold it then later bought a Digitakt upon release. The digitakt is a great sampler/drum machine and I appreciate its immediacy, but I really missed being able to capture loops and being able to manually record snippets of audio without the whole naming and assigning song and dance required on the DT.
So I ponied up and got the OTmkII and haven’t looked back, having 2 FX per track (even if they’re not quite as hi quality) and being able to seamlessly capture loops, etc plus recording with a footswitch, the list goes on. For me the OTmkII button upgrades made it so I barely had to reread the manual, so I’m glad I went the mkII route, personally, over a used mkI, though there are great deals to be had on a mkI if you like the interface.
Sorry, not talking you out of it