It has pros and cons, like anything else. You need to decide if the pros outweigh the cons and make your decision. Assuming it's a decision you can make.
I've been on a 4 day schedule since March and absolutely love it. 7-5 Mon-Wed and 7-4:30 on Thurs with every Friday off. The days don't seem any longer than they were before and I get a lot of stuff done on Fridays