If you have a lot to lose (which is the case for me), I would not recommend having NO syns. Syns are there for a reason. To be USED.
If you are following the original or green plan the recommended amount of syns is no less than 5 a day (5-15 per day), if you are following Extra Easy the recommend amount is no less than 10 a day (10-15 per day). This is according to the body optimise website.
A lot of people when starting Slimming World mistakingly think that having no many syns or no syns will speed their weight loss, but this is not true. 15 syns is about 300 calories, so 2100 calories a week. Cutting them all out, is not really going to have much affect so early on in the diet. Plus if you start off with no syns, when you get a long way down the diet, and do not have much left to lose and the weight is not shifting, if you have been having no syns from the start, you have nothing to cut back on, as you cant cut out your free foods or healthy extras. Also it is worth remembering, that no diet is going to be stuck to, if you constantly deprive yourself of treats.
I following extra easy and always have 15 syns per day. They don't have to be used on just chocolate and crisps and those type of foods, you can use them on sauces for stir fries and a whole heap of other things. But you have them to use. So use them.
I lost 4lbs this week, by following extra easy, having lots of free foods, all my healthy extra's and all of my 15 syns a day.