Has anyone used algebra tiles?

I came across some algebra tiles while going through amazon. I was wondering if anyone here has had any experience with them. I saw many favorable reviews by teachers so I decided to go ahead with the purchase.

I purchased two sets of the tiles since they were so cheap.
http://www.amazon.com/gp/product/B003H5EQLY/ref=oh_details_o01_s00_i02

Along with a book to teach myself how to teach Cayden. It includes reproducible activities.
http://www.amazon.com/gp/product/1583242171/ref=oh_details_o01_s00_i00

I also got a student workbook that includes 70 overhead tiles we can use on the light table. You can find the workbook sold by itself or in other package deals.
http://www.amazon.com/gp/product/B000F8VBF0/ref=oh_details_o00_s00_i00

I apologize in advance if this topic has already been discussed and would appreciate a link to the thread. :slight_smile: