Have the blink XT and the Blink XT2s it seem the more cameras on the system the slower the whole system gets. i also have EZVIZ cameras which are great as well they both have advantages and disadvantages . the xt2 have less frequent false alarms with motion detection but the ezviz have immediate access with and almost no lag at all. the Blinks have free video storage but limited to up to 60 sec with a 10 second reset , the ezviz has cloud storage for a fee but will record all motion for as long as needed , also can use free a micro sd card inserted into cameras but they seem to fail get glitchee when to much recording due to over use or heating of sd card , then there the 1 tb hard drive system for ezviz. Works well continuous and motion triggered recording but if power not wired well you know whats going to happen to your batteries and the cost just for the drive is about $175.00 . i
I also have a ring works well but slight delay to open . the ezviz is best for live immediate view and continuous recording , blink for free cloud recording and past event and for placement in places where battery is a absolute must with need for minimal recording ,even though the ezviz will do same at a higher price.
I find multi systems work best as well as the ring security cameras( not bell ) but they are very pricey to say the least and recording service you must pay for. Also only the battery ezviz with micro SD card will continue to record in power failure due to loss of internet with other systems so