I have been using it on a 3.3.1 site that was upgraded a few weeks ago. It works just fine !!
I had a problem with it on my 3.2.2 site on the admin file manager page, it would give me an error when expanding the portal root folder. Think it was a core problem, not related to the friendly url provider. This is fixed with 3.3.1 and Scott's friendly url provider, so it's even better 
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