They arent for everyone - some like to add a Tyler T-grip or similar to get a better purchase on them. Looks-wise I reckon is in the eye of the beholder. Good thing there are so many grip options to choose from, both factory and aftermarket.
Target stocks are certainly hand filling, but to me they don't seem very ergonomic. They're fat at the bottom where one's hand grip is the smallest. They actually feel more comfortable in my hand when gripped upside down! Combat stocks are good if you don't mind your fingers being kept in a certain position.
As long as you use the right frame size and type (round butt or square butt), target stocks and magnas are interchangeable. The exception is J frame target stocks which will fit either type frame. Forum please correct me if I misspoke.
Todd