We faced outages when the user limit went over a certain number. 

When teaching, I am connected and view everything on a Samsung screen 17 x 24 ins.

Originally, I was disappointed in behavior of the early Ultra version. It did not exhibit to students what I am showing on my own machine. The students are everywhere else, so it's important that they can follow along what I am showing. The user interface during sessions squeezes images to a smaller physical space. For zooming in to detail, Chrome allows enlarging an image, but in a whiteboard window it fails.  It's just not feasible to visualize  detail properly for the students who are connected using small devices

I often use MS Access for prototyping a design, or to talk in terms of dimension modeling, or for running queries. Some students are working on a tablet, laptop or even a cell phone. They cannot possibly see details that I do. 

In the on campus classroom, I don't have that challenge. We're not using Collaborate when the same course is taught, so, displays are on a large screen in front of the room. 

For online courses, a presentation of a final project will be in Collaborate, however, instead, some teachers have been allowing Adobe Connect or Zoom.

I occasionally had difficulties logging in because I think that the system was overloaded with too many people. It didn't have the capacity that we needed for the number of students we had who were trying to log in at once.

An additional feature they could include would be a better tutorial video on the solution. Other than that, it's great.