My at-home microneedling treatments have done wonders for my skin! I had some noticeable acne scarring on my face, as well as some fine lines, and a 1.0mm needle worked great to really minimize those areas. It depends on what kind of results you are looking for and what condition you are trying to treat, but the 1.0mm size is generally the largest you should go with for at-home use. I am not going to lie, dermarolling does hurt a little bit, but my complexion is really smooth now, and so the minimal discomfort was well worth it for the results received! My advice would be to go with the 1.0mm microneedling device for the most drastic at-home improvement. Also, be sure that you let your skin recover fully between treatments, which should be repeated every 4 to 6 weeks or so until you reach your desired results.