I don't use convenience foods or sweeteners and I find SW very easy. Much of the main drive of the plan itself is home-cooking, the website is packed with recipes - I don't always use them, I make my own and just adapt them by drastically cutting down any cooking oils.
I don't go to a group so I don't get the meal replacements or bars stuff promoted at me and they aren't my thing anyway.
As for portion control, well, that is a different challenge, but the emphasis is load up the vegetables and eat enough till you are satisfied - it's not really about the old style of 4 baked potatoes or 10 chicken legs!
The things is, it's about moderation not denial. I love butter, with a passion. SW never says I can't have that butter, it does say "ok, have some butter on your toast, but measure how much you have and understand what that means in your day's overall intake". FWIW, 5g of butter is enough for one piece of toast and is 2 syns (about 40 calories). I take the responsibility of deciding whether I want it enough to have it in place of something else I want later on.
In the end, I still bake with butter and sugar, but I work out the syns for however many portions I make and if I want a piece of cake then I have it and I note it down and I take notice of it. And I enjoy it!