Because I'm in the trade, I'm exceptionally wary as to who I would pick and trust. The biggest issues are UL listing and to what extent (I prefer mercantile safe and vault/UUVX or CPVX) and CSAA 5 diamond.
In my case, my vendor is within the state, has a backup CS within an hour or so drive and another that is in another time zone. I can call and directly get a live person to answer any time of day or night, short of if there is a major event occurring (hurricane, storms, etc.) and I get faxed/emailed anything abnormal with any account, can login remotely and see what's going on and any data changes are done immediately. If I didn't use them, I would've gone to HSMC or a few others nearby.
For those that deal with end users, I'm not too impressed. Alarm Relay refused to answer me if they were UL and to what extent, so much so that they stopped replying to any further queries from me about their service. I don't think too highly of their setup and can't seem to find their UL certificate or to what extent, so that's a red flag, same with their CSAA listing. They also market under their "hidden" company to dealers and the like....why wouldn't they provide their certificate information? Every other CS does upon request.
Who else does that leave, Next Alarm? The third tier, AlarmGrid or others I'm sure I can turn up?
While it's not what most would like to hear, but if any local dealer can't monitor a traditional system for $20/month or less, there's an issue. Only exception is if there's an alternate path or third party charges (cellular is usually the largest). It may change the outward appearance of "freedom" to a consumer, but if the other items are met (UL and CSAA) it's a pretty level playing field.