I decided to try out Nexus to see if the arcane mana was actually worth it since Rogues and Mages tend to have the issue with mana.

Flapjack was slow for both my mage and rogue on catching up with the mana output.

Nexus gave me +2 of the standard mana regen but also each level it went up 10-15mana per level. Currently at level 11 it is giving me 100-110 mana per 5 seconds which appears to be the cooldown for the pets.