I have tried Safari. It works well enough but I found it a bit lacking compared to Firefox. I missed a few of my favourite extensions and customisations. The general look of the browser regarding toolbars and appearance is important to me. I don't particularly like the appearance of Safari. But still, this is only personal opinion. I'm sure there are plenty of people who wouldn't use any other browser.
Regarding speed, Safari could be faster but no matter how fast the browser, speed depends on other factors too. These might be your Internet connection speed, time of day, volume of traffic on the Internet backbone and local data traffic.
Give it a try is the best thing to do. It doesn't hurt to have a few browsers installed. One doesn't affect another and you can always uninstall it if you decide it isn't for you.
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