I will be totally honest in saying that I have purchased about 4 different trimmers in the last 2-3 years. Each one always had some quirk that I didn't like about it. When I found the Tonic trimmer, one of my friends said it was the best trimmer she had ever used and that it cuts clean, straight lines everytime! So, I decided to purchase this trimmer and I absolutely love it! It's easy to use and it never gives me the frayed edges that some of my old trimmers would. All of my old trimmers have gone into the garage sale pile!