I guess I am just a control freak and want to host my own hardware. Same with AC versus cloud solutions, I guess.
Actually what started me down that road was that 3 original lines coming in was not enough, and too many incoming calls had to drop to voicemail. I also was very frustrated trying to get stand-alone music on hold to work properly (the voltage drop on Comcast lines do not trigger music on hold properly). I have used the VOIP-anywhere capability a few times when we had to leave the clinic with no receptionist.
If the Talkswitch box goes down, we will still have incoming lines pass through and routed correctly to the analog phones, just no VOIP, internal voicemail, or music on hold.