If you're lucky enough to find a sirloin roast or sirloin tip roast, then you've elevated a beef roast far beyond a simple pot roast - yummy as that might be. I've done a couple of articles on roasting beef - different cuts and techniques.
The top sirloin roast is flavorful and tender. Not quite as tender as cuts from the loin or rib, but not as pricey either. Although it offers a robust flavor, cooking a top sirloin past medium doneness can be a little chewy.