I just ordered an EF-S 55-250 STM after seeing reviews. I bought it used from National Camera in the Twin Cities. I will pick it up when the governor's order is lifted, presumably May 18. If you buy gear online, you can trust these guys. If they say a used lens is "excellent", it is. No financial interest, just a very happy customer. Anyway, when I get the EF-S 55-250 STM, I will test it against the
EF-M 55-200 I have. The 100-400 L II I have shoots great on the M5, but I can't always be walking around with that beast.