I have had Brightspeed (formerly Quantum) for about a year now and hope I never have to go back to Mediacom. No data limits, much faster speeds, and a significantly lower price per speed. Have only experienced 1 service outage. I had to search a little to find how to contact customer service, but once I found it I was pretty much immediately put in a chat with someone.

I would say go for it. You won't be in any contract so you can always switch back to another ISP.