I am a bit reluctant to use bridges because they are without fail a nightmare to set up and debug. However, Magebridge is about as good as it gets.
The coding is immaculate and the support is also superb. There were virtually no bugs and a couple of minor problems I reported were fixed within days (often hours) of reporting them.
Still, a Magebridge project requires a lot of work and is not for the faint hearted. I would think carefully if you actually need the features of both Joomla and Magento in your store. But if you do, then I would definitely recommend Magebridge.