It's far from being the best and it's far from being robust.
But it is the most marketed, and the most shamelessly marketed for certain.
The editor is buggy, lacking features, and it's been so for 2 years now.
Being written in java does not help at all. There are performance issues as well.

Do yourself a favor and look around, don't buy this one because the website looks to be professional!

I have swithced to nuSphere phpEd just recently and I'm very happy with this latest choice.