But I tried 2 commercial extensions and neither one of them could display my content correctly (sadly, the Joomla core SEF couldn't either).
Anyway, on 2 of my sites, I had to give up using SEF because the core couldn't handle it and the 3rd party developers couldn't get the problems with components sorted ( even after a good amount of $$ spent on support and custom plug-in development).
sh404 is hit and miss, and the "security features" are quite buggy and normally have to get turned off. Am hoping that now that it's GPL/Commercial that improvements will be more forthcoming.