Company have discover that eating their own dog food, offer primary benefit
Firstly, product .. with using the product set .. develop
Secondly, Another company employee .. knowledge of an experience with the company own products
Thirdly, product user can see that the company has confident in his own products
Lastly, technically knowledge .. employee working and perhaps said very wide range .. business situation are able to discover .. any bug in the product before their release to the general public