I had one and I kind of miss it. We have gas now which is my preference, but I do miss my glass top sometimes.
I found it very easy to clean. I'd scrape it with a razor if anything stuck. Anything persistent, I'd lay a hot damp rag over it for awhile and that always softened it up enough that the razor would make short work of it. We had ours about 5 years with zero troubles. We sold it with the house. Mine had a 5th burner in the center that could be made small, medium, or large which was something I actually used fairly often. Mine also had a red light that would stay on if the top was still warm, which was a feature I specifically looked for. I am pretty sure it was a Kenmore.
I prefer gas but if I bought a house that was only set up for electric, I'd buy another glass top for sure.