Some days I have syns..some days I don't use any. I seem to spend them mainly, on ketchup, sausages, hifi bars & sveltese yoghurts (lemon cheesecake - did i mention them before?! haha!) , and occasionally some chocolate. I save syns during the week if I know I going out at weekend, but never have more than 70 a week. You can save during the week - but I think that is as far as you can save them - ie you cant save like 10 weeks worth of syns up
I use my syns for treats rather than meals on the whole. I quite often save all my syns for the day and havea bag of revels at the cinema (I go quite a lot - lol). I also use them for various M&S Count on Us snacks.