What's the best way to use a pfSense box as a secondary DNS server?

[rcfa]

Since in terms of processing power my pfSense unit is far from reaching its limits, and since my zones are rather low traffic, and since various third party secondary DNS services are either costly, complicated to use, or unreliable, I thought I might as well use the box to host a few secondary DNS zones.

Is there anything that strongly speaks against doing so?
What's the best way to go about it? Installing the BIND package? Will that interfere with other aspects of the system?

Thanks!