I'd say OK experience, not great.
They initially walked me through setup and testing. The initial cellular modem they recommended ended up not working, which they said happens 50% of the time. So they sent another
I initially had open and close reports turned on as they suggested. About 6 months later I get a call from them saying this will incur additions charges, so I had to turn it off.
I'm used to an alarm company having a web-based access to do things like putting my alarm in test and maybe cancelling a false alarm, but his company has no web access of any kind that I have seen. Everything is via phone calls.
The only email I have ever gotten from them is yearly they will tell me to renew my alarm permit, which is a bit redundant because the city sends me the renewal form ever year as well. I give them the permit number which they keep track of.
My home owners association has a security patrol so I gave them information on how to contact them, but I'm not exactly sure how they will incorporate that into the response, and I'm not sure where I would call to ask.
I've never had a true alarm, so I can't vouch for that. So to sum up, they appear to be doing what they should be doing, but not lots outside that.