I have a big problem with a lot of cleaning strips/gels: the taste makes me want to gag. Surprisingly, I did not have that problem with these strips. And now for the rest of the review:
Sensitivity: None. My gums/teeth weren't the least bit sensitive after using these strips (even after multiple people telling me I probably would because I generally have sensitive gums and their overall experience with other whitening strips have left them sensitive).
Results: My teeth were noticeably whiter after letting the strips sit on my teeth for the full 2 hours. To keep up the color in-between strips, I use the same brand of toothpaste, toothbrush, and mouthwash (all of which I used a coupon for, which was found inside of the box) and have continued to have good results with keeping the white(r) color of my teeth.
Residue after pulling of strips: my teeth were a little sticky (I guess?) after pulling off the strips, but this went away after brushing my teeth once they were removed.
Price: this is a cheaper price than what you will find in the stores. I highly recommend this product/vendor.