I like that this phone system is very affordable, it's so simple you can set up in under 10 minutes! It also has great customer service if something goes wrong with your account or software.
Nothing too much at all; just make sure when purchasing an internet telephone line they have unlimited bandwidth because sometimes there are limits depending where you purchase from even though its not stated anywhere else. We were looking into other more expensive options but we found out through research after calling them about their plans/pricing how low priced theirs was compared to others around us (like Vonage). This saved our business money as well since most of my coworkers don't want VOIp anyway.