I won't buy another Schlage smart product. I have struggled with the BE469ZP and eventually gave up and put in a Kwikset modified with a Schlage SC-1 cylinder (see saga below). So I got a more reliable lock and still had my Schlage key preserved (to match mechanical locks). I never liked the BE469ZP membrane keypad anyway.
In fairness others have had ok results from Schlage but I am pretty jaded. My experience is all ZWave but I suppose the Schlage smart lock design team is largely the same.
As for grade 1, 2, 3 I guess my thinking is a determined burglar won't be discouraged by any of these. Spending more on a deadbolt isn't going to improve your windows from being smashed or a crowbar on basement window, As they say ... a chain is only as strong as its weakest link....
Schlage BE469 Issues (Again) JS vs. ZIP - Get Help / Devices - Hubitat