Year End Sale - Please help

Hi everyone! I hope you'll all have a prosperous new year. I would just like to ask a question about this deal I stumble upon amazon. Some says it works pretty well but other reviews says it's not worth it. Who among you here have tried the product by the way, if I may ask? I am thinking about buying the product on the 2nd of January. If you have any comments or suggestions that would really help. Thank you so much!