Anyone with knowledge of this "copilot", good or bad?

This should answer your questions. I say GOOD.

http://dieselplace.com/forum/showthread.php?t=97807&highlight=copilot

http://dieselplace.com/forum/showthread.php?t=82543&highlight=copilot

http://dieselplace.com/forum/showthread.php?t=50055&highlight=copilot

http://dieselplace.com/forum/showthread.php?t=116050&highlight=copilot

http://dieselplace.com/forum/showthread.php?t=104617&highlight=copilot

http://dieselplace.com/forum/showthread.php?t=101230&highlight=copilot

http://dieselplace.com/forum/showthread.php?t=116002&highlight=copilot

http://dieselplace.com/forum/showthread.php?t=141500&highlight=copilot

http://dieselplace.com/forum/showthread.php?t=152705&highlight=copilot

http://dieselplace.com/forum/showthread.php?t=155722&highlight=copilot