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I am planning to use plenty of them as part of my base training for next year. Basically starting around 88% for 2x20 and working up to 95% for 3x30 with progressive interval length, shortening rest interval and intensity.
It means the sessions will end up going over an hour but it's a lower stress session that doesn't smash my eyeballs out but is enough of a TSS filler - I'd love to just do long rides all winter unfortunately not feasible for me.
But the whole point of sweetspot training is that it is hard, but not too hard. Sweetspot training isn't supposed to leave you hating life.