I like how easy it is to use, especially for small businesses with less IT resources available or who are just getting started in using this software! It's pretty intuitive once you get used too but there still isn't much customization that can be done without some programming skills which we don’t have at our office (yet!).
There also seems not many options when looking through their website so if someone doesn´nt know exactly what they want then maybe try another provider first? We were able solve all of my business phone needs such as VOip & conference calling along side regular phones via landlines/cellphones while maintaining good call quality throughout both types by utilizing different codecs etc., allowing me more flexibility than traditional PBX systems where calls couldn`T go between cellphone numbers unless one was set up specifically beforehand even though each line could easily connect independently from other lines - plus being part PSTN.