With Pay Per Click Advertising, users will be able to identify that you have paid to be on the first page of Google. However, this will not reflect negatively on your brands reputation. Just like with organic rankings, search engines have set requirements specifically for paid rankings, to ensure that ads are trustworthy enough to be put up.
With Pay Per Click Advertising, ad rankings are not necessarily just determined on how high you bid. Google also looks at your quality score, which is based on how relevant the keyword is to your ad and to what a user is searching for.
People who typically see your Pay Per Click Advertisements are those who are specifically searching for your product or services. Since paid search ads target specific results, you can be sure that anyone who clicks on your ad is not randomly clicking on it, but highly interested in buying your product or services.