Pre-Purchase: Alert delay with battery powered?

Hi All, A quick pre-purchase question if I may. I'm currently looking at adding a Ring Video Doorbell - main issue is that there is no existing doorbell wiring in place, so it looks like something battery powered is the way forward. I'm aware of the shortcomings of battery - things like it'll never last as long as claimed etc. One issue that keeps on coming up when I read reviews etc is the "delay" between doorbell being pressed or motion being sensed and me, the user, being alerted to this. Is that actually an issue to be worried about? I saw one person say they would have actually missed calls at the door because the alert delay was so long. Second question is can multiple people have access to the same doorbell? Two adults in the household - they can both have alerts on phones/apps etc? Very final question - just because this would be a battery operated doorbell, I can still use a chime If I want? Thanks all for your help.