Absolutely necessary! Looks so much better with the panels. Totally worth it.

Love that you can turn the recessed medicine cabinet into surface mount. These work perfectly.

The finished product is beautiful! Gorgeous mirrored sides to your already beautiful medicine cabinet! However, the screws did not want to go into the mirrored panels. I was very worried I would strip the screw head and be stuck with a loose panel. Once the screw was slowly screwed halfway, it became easier to screw in. Based on other reviews, this seems to be a common problem.