Yes, we encourage Value-Added-Resellers and Managed Service Providers to leave reviews for products. They often know products inside out and so can share unique insights.
However, you must be clear that you sell the product and not aim to misrepresent the product to further your own interests. Your review should be written with the primary audience in mind of other VARs or MSPs looking for a product to sell, rather than end customers looking for a solution.
If you hide the fact you are an MSP or VAR that has sold or are currently selling a product, your review may be removed.