Very good components with an amazing (magic) integration with the original SynEdit components. They offers good features, but, for me, the mainly feature is that SynWeb include support for HTML 5 and CSS 3 stuff in web documents. Thanks very much for creating SynWeb Krystian!
The integration with existing components is really easy. The syntax check "on the fly" is very sophisticated and much more significant than the corresponding SynEdit highlighters. A very high level of parameterization, ... Synweb. What Else?