I had a lot of thinning especially at my temples and hairline. My hair is very thick and no one seemed to notice but me. The only time anyone said anything was a few months ago I was at work and all my baby hairs were wildly flying about everywhere...
The amount you lose will vary and how noticeable it is depends on how much hair you start with. Mine is growing back now I am fifteen months out, so it is temporary for most of us.
Losing a bit of hair, loose skin and all, I would not change my decision.