Are sleeve gastrectomy complications ever serious?

I'm an oversized gentleman who weighs a little over 310 pounds right now. I think I'm a pretty good candidate for a sleeve gastrectomy but keep hearing there can be serious complications with this operation. That stated, it seems like everything that's good like this has the potential for complications, that's all I ever hear so I don't know how seriously I should listen to any of this. So my question is just how serious are the potential complications and what is the likelihood anything bad could happen anyway? Right now I'm hardly concerned at all but my daughter is easily scared about this stuff and doesn't think I should get one because of it. I guess I don't know what to think. How often do these things go bad? And if they do, just how bad is it? Thank you very much.