Short answer… no, they are not.
This is possibly the very last thing a cyclist should invest in for marginal gains, literally right after a jersey made from banana skins… slippery 
Training makes you faster. Buying overpriced cycling gear based on almost no real science, simply makes you a sucker.
Yes, gizmos are great. We all like bling gear. Use your brain, resist BS marketing. It’s virtually always complete fabrication.
Use every spare cent to facilitate more actual time to train and recover effectively. That WILL make you faster.