RichardL you don't see recipes written for the greneral public using compounds for many reasons, mainly costs and availablity. But when you use professional and French recipes they do call for compounds to enhance your flavors. They also call for fruit purees that many chefs purchase, to intensify the taste.
The many compounds used alone aren't that exciting, but then their are many that you can use alone and they pull off your flavor. For instance my freind thinks the tiramisu flavorings from amoretti is to die for. She uses it in her chocolate mousse.
My favorite compounds flavors are pistachio, almond, lemon, coffee.
The reasons I would use a compound vary. Usually their flavorings are sooooo natural that an extract (they are far more natural tasting then bottled extracts) or liqueur taste too strong in comparision. I'm also not that fond of using alot of liqueurs in my desserts. I don't think most American like them in tortes unless it's a specific liqueur type dessert. I also use compounds because they are THICK and don't water down my dessert like real liqueurs do. Say I'm making a mousse, if I add too much liquid it might not set, so I'll use a compound and it won't require a large enough amount enough to weaken my mousse.
Some compound brands taste better then others, regardless of price! I haven't used amoretti brand, but I have a friend who loves them. She uses their swirl product in her cheesecakes for a quick variety.
You never know why someone might want a cheesecake compound. Perhaps they are using it in a ganche to add interest or a frosting....
HTH?