@leland is 100% spot on. Having used bbPress before I found it cumbersome and found that tickets easily slip through the cracks.
HelpScout coupled with Gravity Forms makes the perfect solution for any companies support or customer services needs.
Top it off with Help Scout docs which can easily be integrated into your site via their Beacon tool & a free Gravity forms addon by @pippin & @zackkatz with some community driven improvments that allows you to force users to search docs as part of submitting a ticket.
It is with no doubt the best solution without spending a fortune per user for an enterprise solution.