I have, I've lost about the same amount of weight on SW and WW but for some reason in the first week of both I lost loads. I.e. when I switched from SW to WW I lost lots that week then it settled to about 1lb a week then when I switched back from WW to SW I lost lots again and then it stabilised to the same 1lb a week lol. I think what sparked the bigger loss was changing things around which reinforces what SW always say, keep your diet varied and you'll have good losses!