I've recently installed the Staywell Petporte, so far it is working well. Looking at the build quality, it appears to be sensible with decent solenoids. Physical construction is good, with M8 bolts to clamp inner and outer, or a screw to inside/outside option (which is what I have, going through a wall). Programming options are good, including extending or reducing the open time (needed if you have a scardy cat like ours, who sits looking wondering if something nasty is going to happen inside) combined with a reasonably sensitive outer sensor. On the less good side, I'm not impressed with the quality of the power supply, which runs warm -I'm considering swapping out for a switching supply modded from an old phone charger.