I haven't had the surgery (yet? I guess we'll see), but I do have bunions. The left one is most noticable, sticks out maybe half an inch, and the right one is smaller, barely noticable. I have found that VFFs reduce my bunion pain *a lot*, something no other shoe has been able to do. It took about a month of slowly wearing them longer and longer distances and times (when I first got them, my foot muscles would ache if I wore them longer than a half hour) but eventually my muscles adjusted and I could not be happier with them.
My mom, who has had the bunion surgery, says she would love to be able to wear VFFs but unfortunately her feet are a little too wide for the soles that they use. Hopefully as VFFs become more popular they will be able to start manufacturing a bigger variety of foot shapes/sizes. I see you are a fan of New Balance, for a long time they were the only athletic shoes I would buy and they are still my mom's favorite (just for estimation, I'm usually a B width, my mom is usually a D), but for me, VFFs beat NB hands down for bunion comfort.
Really, though, the only way you will know is to go try them on yourself. Go to a store (you can use vibram's website to locate one near you) that carries a bunch of the different models. Personally I prefer the Bikila LS but it has nothing to do with bunions, I find the quick lace more comfy than the velcro bands.
“The goal of life is to make your heartbeat match the beat of the universe, to match your nature with Nature.” -- Joseph Campbell