for me it's more than a fancy timer but rather an integrated system.
for example during water change, if you turn off the return pump, you can add another logic that turns of wavemaker, heater, and ATO. this bypass many hassle of remember what needs to be turned on/off during your specific task.
i also have 2x Trident for my display tank and frag tank. although Trident really isn't needed for the frag tank, but the ability to know the ball-park parameter of my tanks at any time is worth the price tag and the refill reagents. i have not had any issue with Trident and the readings are usually within 10% when compared to my other digital Hanna checkers.
for my display tank, i have the Apex Wifi with 3x EB832, FMM, ATK, LDK, Trident, and some other apex add-ons. For my frag tank, i have the Apex Wifi and EB832, DOS, Trident, and some add-ons.