I've been with girls who had implants and girls who haven't, and there are things I like about both and things I don't like about both. So I don't really prefer one way over the other, I just prefer them to be atleast a C cup, probably no more than E, and my favorite in the middle at D or DD. Mandy's are very nice and her surgeon did a good job, so there's none of the problems that can make the end result undesirable.
And since you've brought up her ass, is it just me, or does she seem to have put on a little extra there? I don't mean in a bad way, she always had a nice ass, but she seems a bit fuller there lately, and I think it suits her.