This model appears to run a little bit large. If you are a med, you might want to try small.
One unlooked-for advantage of the lace model: it breathes really well and that translates into better comfort for the wearer.
Another advantage: good ergonomics; plenty of space for a gentleman's "package"
Disadvantages: I am not crazy about the feel of the material on my skin. The whole underwear is lace with no kind of pad under the genitals.