We had an elective at 15w2d because my a/s won't be until 21 weeks and I'm impatient :)
I have to say, the tech that did mine was *fantastic*. She was as actual u/s tech prior to going to work there, and she pointed out a lot of things along the way I wouldn't have expected at an elective, like showing us the kidneys, stomach, etc.
As far as the gender goes, she said she is never wrong because she won't guess, she'll keep bringing you back to be scanned until she KNOWS. Luckily it was obvious on ours, no question he's a boy. She checked from every possible angle(multiple times during the 45 minute scan), and the parts were clearly visible, including a shot that shows both the penis and the umbilical cord from the profile.
I don't know if our experience was typical or not, but I am 100% certain she was correct.