It would be relatively straightforward to announce the scanners you use without disclosing your analysis/correlation tools (which presumably is where you're looking to add value here?)

I'd echo the other comments about being very careful with language like "non-intrusive", I've taken systems down with a single ' character in a login box before or by carrying out basic port scans.

Now obviously you could say that a system that fragile has bigger problems, but customers tend not to feel that way if something bad has happened to their site on the day you're scanning them...