AT Conference vs RingCentral

I've used RC for four years to serve a medical practice. Everything has gone just fine and according to expectations. I recently needed to replace an on-site PBX at a church (12 stations) and decided RC would be a good option. Six of the 12 stations had to be analog over existing TWP phone wiring - including an elevator phone. There was some problems getting the sales person to understand the application (the five analog stations were really just emergency phones in school classrooms, a kitchen, etc.) and that I didn't need full VoIP features for those stations. Anyway, looking online at the Cisco ATA devices for this application was important - as was asking to speak to an engineer who could answer detailed questions. For example, the RC firmware for the ATAs disables the second phone port - so one ATA per phone is needed. Ordering the equipment through RC simplified things (I did ask them if they could meet Internet pricing for the VVX 150 phones and the ATAs - they came very close). Cutover to the new system was smooth and everything is working as planned. Now, you can probably guess that I worked in this field and knew the right questions to ask, etc. All I'm going to say is that RC delivers a good product but you have to be sure you know your application and can work with (and perhaps through/around) the sales person to get your configurations defined. This is not your parents' telephone system. Price is fair - especially given its reliability and avoidance of on-premise equipment maintenance fees.