On the one hand, the Mincome experiment ran vastly over its budget. On the other hand, it monumentally decreased the symptoms of poverty and improved living conditions, while turning out to only reduce people's "practiced work-ethic" (ie: real work-hours) by 5%.
Mincome in Manitoba. I don't read too much into it and think it's pretty debatable that it failed, but one thing it certainly did show is that people wouldn't all suddenly stop working. IIRC only one group of people actually decreased how much they worked significantly: teenage mothers. The modal response was continuing to work and using the extra money for extra consumption.
Who has tried basic income and failed?