I don’t like 'em.
From a collector’s standpoint, they’re horrible to collect. If they’re over 10 years old, they won’t work so they’ll just sit around collecting dust on a shelf.
From a homeowner’s standpoint, because they’re billed as ‘set and forget’ devices, once a homeowner has them installed, they’re liable to just completely forget about them even after ten years, and they may not ever get replaced.
In my opinion, the best kinds of smoke alarms are the 120-volt interconnect kinds with battery backup. This ensures that if one smoke alarm trips the entire house will know about it, and even though you do have to replace the battery once in awhile, the alarms don’t completely run off of them like regular 9v ones. The problem with them, however, is that they’re expensive! And good luck trying to install a system of those in a house that originally never had smoke alarms.
Another good option is 24v system smoke alarms! I’ve been in houses where the smoke alarms are i3s with sounders. It’s great because not only do you not have to bother with taking down each detector to replace batteries, the batteries the system DOES take are just two 12v rechargeable ones. That’s only $60 every 7-10 years, as opposed to several dozen dollars every month for several batteries.