From the above post:

If you have purchased a product from us before take 5 minutes out of your day and leave a review and you could win.
Each month we are giving away a brand new T8-AML-V3-S for the best review of the month. To leave a review simply click on our online store. Find which product you have purchased and leave a review for it.
As we said, the best review each month will win a brand new T8-AML-V3-S.