1. The vendor has been providing poor quality products. That's why the perception of the vendor is very bad.2. When she and I first met, I did not get a good impression of her. She seemed high maintenance and hard to please. As we get to know each other, however, the impression began to change. She turns out to be one of the most easygoing people I've known.
 perception impression一班來說 perception 跟 impression 能用在所有地方，但 perception 較用來形容對事物的印象，例如公司或商店，而 impression 較用來形容對人的印象。
He excels on all fronts, putting the rest of us to hame.