… is not recommended!
If like me you sometimes want the features offered by the visual editor, yet at other times prefer the plain old one – and chop and change – you’re likely to end up editing posts in one editor that were originally written with the aid of the other.
Cripes – what a mess. 😦
The HTML added by the visual editor can end up looking like the worst tag soup from the old HTML3 days. There are nested and repeated strong and blockquote tags, and whatever else you were trying to add or delete. It all keeps piling up …
I had to go in and manually remove a load of them in one post, because they were preventing proper formatting. This WYSIWYG stuff has got some way to go yet.