100% agree. I have cell monitoring on my alarm (after dropping my landline and not having reliable transmission with an internet reporting box provided by the alarm company). While I pay around $265 a year, I get more than that in discounts on my homeowner's insurance. Make sure you check with them regarding the discounts, they usually discount for a monitored burglary/fire, then add more discounts for CO detectors, freeze detectors, and flood detectors. I bought many of the detectors on eBay for $20 or less.
GV is NOT reliable for an alarm panel to dial, nor is any VoIP provider. The transmission of tones over the line, once a connection is made, is the main issue. If all you want to do is get a phone call on your cell, and use identification of that number as telling you the alarm went off, then you can do that.