At first we had purchased a huge license for use by many members of the team, but this was costly and we found we didn't use it nearly enough to warrant that.  We scaled it back to one login for one tester.  I'd advise anyone else to start small and only grow the size of the license if needed.

If our service goes down or has a JavaScript error on particular browsers, our customers would notice and look for alternatives. I am able to continuously test my new releases across browser versions without issues.

It has already paid cost back