[Singapore Math Advice?]

In the past week I have had two different people rave to me about Singapore math.  Is anyone here familiar?  What are your thoughts on educating young children with Singapore math?  Can you recommend any quality (and hopefully free) resources?  Or is there a good case to be made to not teach Singapore math to American children who will be subject to American education designed exams?

[Hello]

We are new to this forum and new to homeschooling.  We have three little ones and would like to find help for pre-k educational tools in addition to primary education years