I have been using Earth Balance and I like it a lot, but I have heard (but not checked into personally) that Blue Bonnet Light Margarine is in fact vegan and I would imagine that is WAY cheaper than Earth Balance so once I am through this container I will probably check out the Blue Bonnet. I do not use a ton of butter/margarine so it isn't a huge deal to spend the extra $2 but it would be nice to find something cheaper.
I am with whoever it was that said they use a lot of oils instead of butter. For cooking/sauteing it works very well and usually has a better flavor! Hope that helps!
Blue Bonnet Light is vegan, but it is hydrogenated and has a lot of additives that I prefer to stay away from. If that doesn't bother you, then you can safely buy BBL. It is vegan.
Smart balance makes one vegan margarine that I like. It's organic and whipped. They had or have another vegan one that is made with a lot of flax. This one didn't taste as good and I couldn't cook with it very well.
The whipped Smart Balance is very similar to how the original Earth Balance is, which makes sense if they are owned by the same company. If you're concerned about taste and how the product performs, I've found nothing closer to real butter than these two items. I think they taste better than the real thing, actually. They bake just as well and they pan fry almost as well as regular butter. You can even make great frosting with them. If anyone has tried to use margarine for frosting, you know that's a big deal.
I also like that the oils used are expeller pressed. That's probably why they taste good.