I am using it. It works. If you pay you get instant notice when your node goes offline, otherwise its delayed. I also use their watchtower.

Brunswick

Daily discussion thread

saloon

I just noticed I can generate a referral code for the telegram bot I use to monitor my node, here is a free 7 day code for whomever wants it.

"Hey, there is this cool service for monitoring your lightning node. Set up monitoring by saying /start to @lightningwatchbot , then send /referral 1110433454 and we will both get 7 free days 😉"

Just comment if you used it.