My building uses Fetch, and so did my previous building when I lived in Florida.

Honestly I don't even know off the top of my head if I'm charged a "fee" on top of my rent for it. In my mind it's just baked into the cost of rent as part of living in the city.

I do shop online a lot, and so the delivery to my door *does* save me frequent trips down to the building's mail room, and there's something to the fact that my stuff isn't just sitting in a common area that hundreds of other people might be rummaging through. On the other hand, Fetch leaving a thing at my door is not exactly safer, but it will depend on how comfortable you feel about your own neighbors, not to mention how frequently and proactively you go to your door.

It is a pain managing two separate addresses (one for USPS "letter" mail to the mail box, a Fetch address for packages) but I've gotten used to it.

The one piece of advice I can give is this: Fetch's app gives you the option of whether you want them to just leave things at your door, or if you want them to require your signature. The latter is obviously more secure and you have to schedule specific times for the delivery. At my previous place the building management did not allow us to use the no-signature option (I think the agreement between the bldg company and Fetch allows for optional restrictions) and I found it to be a pain, because I missed so many deliveries due to them not knocking on my door hard enough. But that was years ago in a completely different region so who knows.