I've recently purchased WYSIWYGPRO and I have to say I'm really very impressed. I noticed the reviews below are quite old and for the previous version, so for those looking at this component, I'd really recommend testing out the latest version 3 on the demo site here:

http://joomla.wysiwygpro.net/

It looks like the developers have done a huge amount of work to address all the issues below and it is very solid and I'm particuarly pleased about their ongoing development of a decent editor for J!1.5.

As the developer of a site, it's an excellent product for customization, html formatting in source code view along with intuitive pop ups accessing your image library, cut and paste from Word and table layouts etc...

However I really purchased this for it's front-end editor WYSIWYG functionality...

I'm building an intranet portal for some guys who are specialists in their field but they also need to keep parts of the intranet up to date with best practice, sharing of information and the latest documentation.

They just can't do it with e.g. TinyMCE - as it is immensly frustrating and fiddly to use when making basic edits to text formatting and the page looking different in the editor to when it is published.

Since introducting WYSIWYGPRO it's made a huge difference with editing and styles matching the template, better table layout, copy and pasting and basic formatting of text.

As such, I'd really recommending trying it out.