If you are only looking for UX vidyo has a decent product, Microsoft's latest enterprise offering is good, HPs halo now owned by polycom is good, polycom has some cutting edge stuff that is good but very expensive.
But it's important to remember that UX is only about a quarter of the total experience.
If the UX is so bad that people can't make it work and have to resort to putting someone's laptop at one end of the conference table instead of using the conference room AV, then it doesn't matter how good the other three quarters of your system is.
Many value UX higher than that, but even for those who don't, 25% is still a whole heck of a lot.