I have yo-yoed now for a couple of years but think I am going to go back to SW in January, I don't want to go to the meetings though - they drive me insane, they last way too long and I seriously struggle to get anything out of them. I am tempted to join online rather than go to a class - do you get some support if you need it still?
I can't answer your questions about Slimming World online but I weigh myself on the machine at my local branch of Boots. I find it is fine as long as I always use the same branch as there are discrepancies between different machines in different stores. It costs me 70p per time but I find that having the little ticket attached to the front of a fridge with a magnet is a great motivator.