This is true of most UPS Stores.
There's a reason I keep mailboxes at 3 of them.
Outside of the shorter hours than some of the dedicated places I'm generally happy with my mailboxes.
As for storage, it's a YMMV thing. Technically the number of packages per week is also YMMV. There's a couple that limit you based on the "size" of your box, forcing you to upgrade to a larger account to receive more.
But the ones I've settled on are quite nice. The one I have in Montana will store for however long I want (within reason)