Caseta is designed really well. No neutral needed, 3 and 4 and 5 way switching can be handled by a single smart switch and multiple pico remotes if you don’t mind a little connecting the travelers in the boxes and you don’t want their actual three way switches, they don’t care about polarity... all sorts of good reasons to use them.
As someone said, the 50 device limit in the hub if you need connectivity to other automation and voice command toys, could get in the way a bit, but they’ve upped it a bit.
The ability of the pico remotes to be paired to multiple smart dimmers can allow interesting things. An example is you can have individual control of say, a porch light and the lights on the garage at the main smart switches but have a pico remote somewhere else that turns on both smart switches simultaneously.
Caseta dimmers do leak some current to the light bulb as their way of powering themselves so VERY efficient LEDs may flicker or glow dimly. They make models to help alleviate this as well as their own branded little capacitor in a proper insulated package that can be put across hot and neutral in the switchbox to leak that current to ground before it goes to the bulb. A tiny vampire load of about 5 mA.
And if you’re having trouble figuring something out, they have an excellent tech support staff who’ll walk through it and even ship out the correct things or those little capacitor shunts, if needed. Quite good documentation too.
It going higher end, many seem to like Insteon. And if you don’t want to touch any of it and want a pro to do it, keep in mind all of the major manufacturers make pro models and systems of this stuff that aren’t all available to the public. Some of those can do more things. You can find online discussions about the big pro systems in home automation forums.
But for adding a switch where one isn’t for a home gamer? Yeah. Caseta. Super simple and work well. Very few reports of failures. Not scary cheap Chinese stuff with questionable or flat out fake UL labeling, etc etc etc.
Keep in mind if new to this stuff they make both smart switches and smart *dimmers* and pick the one you need. If you have LEDs, make sure they’re the dimmable variety if you go with the dimmer. Most non-dimmable will flash when dimmed and perhaps self destruct.
I’m not done figuring out some mess in my upstairs wiring and what I want to do about it, but Caseta is highest on the list for the smart retrofit.