RokCandy allows you to create complex HTML output as simple macros to allow your complex content to be created quickly and easily with a minimum of fuss.
I used RokCandy with Joomla 1.5 some years.
And I tested RokCandy with Joomla 1.7.0.
All worked OK.
But macro not used switch from category.
Macro work if category swith to other language or of category.
If you switch on support category option (ON/OFF and language) - RokCandy will be ready for Joomla 1.7.0
If you want I can help you as tester of new release or etc.
With this time, you can really go nuts and create all sort of things. For me, I create an auto iframe small little tool that replaces all my wrappers on our site, making it much easier to integrate other pages within joomla. (eg: Serif.com WebPlus created pages)
The real issue here is you begin using RokCandy throughout your content, and then that Plugin becomes broken you cripple your website. Especially if you're stuck in an old version of the plugin.
It's too bad. Spectacular plugin otherwise.