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I've used LIFX, CHEAP CHEAP (eFamilyCloud) bulbs and now I've tried these TP link bulbs. These are the worst by far. They forget their settings and don't reconnect to wifi if you turn them off for an extended period of time. You cannot share the bulbs with multiple family members within a home (the official recommendation is to share your account and password with other members of the household) which left me speechless. The only redeeming feature is that the Kasa app looks nice, but again, is useless due to lack of sharing. Avoid buying these unless you live alone (and plan to forever) and never turn off your lights at the switch and never have power cuts.
After any power cut it comes back ON, irrespective of its previous state. Really dumb design, so I won't be buying any more. Nobody wants all the lights in their house to come on if there is a power cut - especially if away on holiday.
Shame, as despite all other aspects of performance being good this stupid feature makes it unusable.