There are a lot of disappointed reviews on here that the tool didn't work as they had hoped. This is a very high quality tool that works quite well for what it is. This isn't going to work on blemishes where the whitehead hasn't come up to the surface and isn't going to magically extract all blackheads if you don't take the time to properly steam your face and slowly work your skin.
That being said, I have still found that the shape of the narrower rounded side could be improved for maximum extraction. I can't ever seem to find a good angle for it to be effective. I prefer the flatter side for both whiteheads and blackheads as I feel it is more gentle and effective.
BE SURE TO STERILIZE BETWEEN USES!! I keep cotton balls and rubbing alcohol nearby to clean between each press on the skin. If I am able to pop a rather large blemish I will use the rubbing alcohol to gently dab the skin as well to disinfect. So far I have not experienced any redness after the fact except for the 20 minutes or so immediately after use.