Matt M said:Scott....I have read that post before, thanks. I would agree that silicones are not detrimental to your finish, but would counter that by saying that it can cause trouble with later paintwork.
You also said "It is common knowledge that silicones do nothing to help protect your paint either." I'm just asking you to back that up.
I know that unless you properly prep a car prior to painting, any silicones left can cause fisheyes and other problems. That doesn't mean you should never use them. A good paint shop knows all about silicones and can clean them from the car properly.
Let's also remember who wrote the article. A Meguairs' employee.
I'm sorry, but I can't take that article as unbiased.
Ah, but you will take their word when they say NXT has cleaning ability. Just because he works for Meguiars doesn't mean he is wrong.
You also take Sal's word that his products contain no abrasives or silicones.

About the NXT...I only posted what was written by a Meguiar's rep on another site. Again...not my words...his..and it was posted by the author of the article. Whether the ingredients are harmful or not...when I tried the NXT product I was very disappointed.
My own experience with NXT shows me that its cleaning/polishing ability is very light, at least by hand. I don't know which Meguiars rep you are speaking of, but Mike Phillip's account is that NXT's cleaning/polishing ability is minor. There are several threads on Autopia where this has been discussed.
If you have a preferrence to one product line over another, fine; but there isn't a need to bash another product to build up what you like.
Was this even necessary? "I have used Zaino on all my cars...showcars and daily drivers...and I find it to have no equal. I tried NXT and thought it was junk. Even Meguairs Cleaner-Wax did a better job." Why not just state your reasons for liking Zaino and not even mention NXT?
I have good friends that own a body shop. They keep silicones out of their shop as much as possible. Silicones cause fish-eyes and other adhesion problems. This is common knowledge. This is why many products directed towards professionals are listed a "body shop safe" when they do not contain silicones. I am following the advice of who I consider absolute professionals with decades of experience.
Hey look...I certainly do not have all the answers...that's why I'm here.
I know several body shop owners and I myself took a paint and body class. They (and I) know how to prep a car for painting so any previous use of waxes containing silicone are completely removed prior to entering the paint booth.