Has anyone heard of ETL?

Are you referring to this ETL? http://www.etllearning.com/ I browsed through the website and it seems cover quite a comprehensive learning for preschooler age. However, I guess it will be quite pricey. For any books or curriculum or program you purchase, as long as you believe in it and use it consistently, you will see the results in long run. For example, for myself I am a big fan of Montessori Approach and thus I concentrate and put my efforts in it and I can see the results in my kids.