I do use all my weeklies, it makes the plan so much easier. I get regular losses of at least 1lb. Personally I've got the view that I will have all my weeklies each week until my losses stall and then I'll cut them down to kick start the losses again.
I also have them as I think WW wouldn't include them into the plan if they were likely to hinder your weight loss, however I do know some people have STS or small gains using all the weeklies, so I guess its also down to how your body copes with them.