Prove it. Prove to me that being implanted early is the REASON why deaf children can speak very well.
I have very good speaking skills, and many times *I* have to tell people that I'm deaf, and they don't believe me until I show them my hearing aids, and I don't hide it. While I don't have 100% perfect speaking skills, no deaf person does, including your children. Heck, including many many many millions of hearing people. There's accents, there's dialects, there's lip movements (gawd, some are SO hard to understand!), etc. It's not just the DEAF people, but it's hearing people too.
I feel like I have to keep repeating myself...it all come down to EDUCATION! if you have a lousy speech therapy while growing up, you won't speak as well. It's that simple. Place an Asian child in Georgia, the child will have Georgian accent because that's where he grew up. It has nothing to do being deaf or BEING IMPLANTED! Place a deaf child within a Bi-Bi or TC environment WITH amazing speech therapy, you will get a well rounded deaf child that can speak fluently and write in English. Place the SAME child in a deaf institute with poor speech therapy, the child will have poor speaking skills.
While, I agree that being implanted does help with sounds, and probably speed up speech therapy, but it's definitely NOT the reason why they speak so well.
There's a few people that got CI as an adult, and they speak very well...I can name quite a few on this forums.