Reply to x1 or f1 to add withe 4trak

im looking to add something to my numark 4 trak, just wondering how much more can you actually do with an x1 since the 4trak has a fx bar ? would i really use it ? and how is the F1 ? is it as fun as it looks, and is the F1 primarily used to launch samples and loops ? and you can finger drum on it right ?