Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Challenging Rides

I have bought multiple Paul Gallas videos. This was my first buy and I must say that I do like them. They are definitely challenging, which is one of the key qualities that I like in a cycling video. I like that this comes as a set and if you are crazy or mad, you could technically do all of them one day if you wanted to see if you could survive a century ride. I have survived doing only one of these videos at a time, which was quite challenging since some of them are two hours.If I were to improve these videos, I would want to see more brillant colors. The second thing I value highly in a video is the scenary. Although the scenary is pretty, Paul's Utah videos top these ones. I do like them as an addition to my collection because it mixes it up and by the time I am done, I know that I have knocked it out of the park (TKO).