i wanted unders but was told i was having overs, i wanted to know why and apparently it depends on if you have enough breast tissue to cover your implant. from what i have read overs are usually done on girls that have alot of breast tissue (had boobs then lost them due to weigh loss, or like me had kids and breast feed or have some boobage to start with)etc. unders are usually done on girls who are very flat chested or the surgeon does not think that the implant would fit over the muscle without really seeing the implant shape.
ihave looked at loads of overs (sara11) above being one of them and i think they look brilliant. i am glad im getting overs now.