It depends on the class, and even then it is mostly just screaming at you. We definitely did get messed with a lot the first few weeks, but not too much eating by the numbers, more getting beat right before chow (stuffed in the cookie jar especially...the SUYA was closed for the first month at least, so we got a lot of quality cookie jar and rose garden time instead), or having to go in and out of chow hall over and over. When we actually got around to eating though, we were mostly left alone by the DIs. We were on liaisons until RLP though, and they messed with us a lot, especially the first 2-3 weeks. I had probably the toughest DI there (maybe one or two others on or near the same level), so did not exactly get lucky (the class behind us did, however). We also got practically no food privileges and when peanut butter and cereal were given after getting the drill streamer it was turned into a competition which ended up with my squad not getting them until about 3 weeks after the initial squad got them in week 5. My DI also implemented a new 4.3 mile route for run days from the old 2.7 mile.
I know at least 5 guys (including myself) who wore them. None of us got in trouble. That does not mean you will not though. It also says no electric razors on the website, and I know my class team allowed them, as well as the class team whose class we indoc'd, so ymmv.