I have Fugus and other thicker zipper models, so was skeptical about these, but I’ve been nicely surprised. Very comfortable and warm and way less bulky. Yes, you really have to learn how to put them on.
I have gone through many winter overshoes through the years. They just get beat up. I decided to invest in these booties and I can confidently say these are the best overshoes I have worn. I have been out in 26F (-3C) weather and my toes stayed warm. That's all I can ask for. Here is a tip. Do not try to put these on for the first time if you are running a little late for your group ride. There is a learning curve with these booties. Practice first. Put the boot on first with your foot coming through the cleat (front) hole. Kind of bunch it around your ankle. Put the shoe on then work the heel of the shoe through the cleat hole and settle it into place then pop the toe over. After one or two times, you'll be able to pop these booties on and off.
Pros: Warm toasty toes
Cons: 1) Learning curve. 2) I would like to see a reflective strip on the bootie for some added safety.