I spent a good amount of time on one of these after a phone interview for a company I was mildly interested in. I’m confident it met all requirements, yet I submitted it and got no response one way or another. I could have put more time into it, but it met requirements and I thought, in the real world, would this company need me to make everything perfect or just good enough? However, in these take home tests where the implementation is so simple that submissions are judged on factors other than code correctness, it becomes an arms race between applicants and who has the most time to jump through hoops. I’d rather do a white board test and if I fail, have a chance to redeem myself with a take home test. In my experience it wasn’t worth the time I put into it. At least it helped me make a decision.