VoIP, especially multi-tenant voip like conferencing is 70% dependent on YOUR local network connection and 30% the provider's infrastructure. Having a high bandwidth pipe is no guarantee for 100% clear and jitterless voip communication. Have you had a network engineer take a deep inspection of voip traffic to see if there's any QoS or packet filtering going on that could degrade performance (i.e. if you're a small office that has your voice traffic occurring side by side with literally every other network device you're GOING to have a bad time).
You can join a concall via phone number + pin, from your desktop, or from the mobile app. The mobile app will even let you view screenshares or video conf.
The dedicated app runs on just about everything'; iOS, OSX, Windows, Android.
On phones you can use Video and Audio or just plain Audio (Low Bandwidth mode).
You can send your BlueJeans room URL and they can join with just a web browser (Web browsers get less features though). Non-Hosts can join the meeting without signing up for anything. They just click and join.
I think the audio and video is pretty good. Much better than Facetime, which is not a good comparison because Facetime is pretty terrible. Audio quality is good.
There is dedicated hardware that supports BlueJeans so you can use it in conferences rooms.
You can record meetings.
All the standard stuff like screen share and what not. You can even ping pong back and forth. I worked with someone where they had to type in some stuff and I had to type in other stuff on their computer. They just joined my BlueJeans room and when I was not typing, they could type. No clicking to take control or give it back, it was more or less seamless.