I had submuscular, 330CC silicone, with the incision in my breast crease.
For the first few weeks post-op, I remember every other day I was terrified I went too little or too small. And I think sometimes I still think that when I catch myself at a bad angle. I used a VS Miraculous bra a few months prior to surgery to try to make my change less noticeable as I honestly have only told close friends, my boss and close family. Anyone I haven't told hasn't noticed (or at least hasn't mentioned) but it's sort of like I went to the exact size I was trying to achieve with the Miraculous bra. And at least in my opinion it looks way better (and feels better) than it did with all that padding. And now I don't have that awkward moment that I had in the past where my bra would sometimes thud when it hit the floor!
The biggest thing for me to get used to going from someone with little-to-no cleavage to someone with cleavage is appropriate wardrobe (I'm somewhat conservative and most of my V-Necks now need a camisole for work). Also working out feels a lot different! I notice I even cup my boobs in my apartment when I run downstairs if I am not wearing a bra as I don't want to get saggy! It's just a different sensation (not to mention boob sweat. Sigh, one draw back to breasts...)
The only other thing is that I know you always hear that BA will not fix self esteem problems. I never understood how that could be because I always felt like "If I just had boobs, that would make me happy" I do have to say that after my BA especially because you invest so much time and money I was incredibly worried and self conscious that I would hate my results or that I'd have some tragedy. I don't think mine are perfect, but I don't believe in perfect breasts anymore. I do sometimes still long for having natural large breasts - that will never go away because it's sort of like that was what I really wanted and no one can ever give you that.
When I looked at before and after I also noticed that you can always see the boobs usually stay the same before and after - so when selecting a doctor or a size, try to find pre-op boobs that are a similar shape/fullness/size to yours. It is freaky sometimes how much of "me" is still there when I look down, but freaky in a good way.
I do feel much more attractive and comfortable in most situations (I don't feel like I need to wear a padded bra to the gym for example). I also did it fairly young (25) - well before I had any sagging. I do worry that I may have difficulties breast feeding some day, but that was a risk I was comfortable with going into it.
You can see my before/after on Dr. S website - I'm currently case 2. I don't have many before personally but I've uploaded a few pictures that are post-op about 6 months.
I'm happy with my results, and I would be very happy to help anyone I can. I don't think I'm the typical candidate for BA - no one I knew guessed I would ever get one. I know for me the forums are sometimes hard to read when you're getting advice from someone who just got upgraded to 900CC and you're just looking for something natural.