Success express is an old plan which is now very similar to EE. You can have 2 of each HE's a day, but each meal needs to consist of 2/3 superfree food and 1/3 free food, and your snacks can only be syns, HE's or superfree (no free food snacks). It was always touted by SW at giving you faster losses, as the 2/3 superfree was limiting your calorie intake.
Fast Forwards is a plan given out by consultants if someone is really struggling with their weight loss. I've not done it myself, but from what I understand, it's very hard, not very fun, but very effective at getting things going again. I think your consultant works out how many points you're allowed, and then you have a list of food and meas you can use it on, but once they're gone that's it - Very different to the normal SW plans, and only ever used as a 'last resort' option.
I've done success express before and it works well!