Triggers

Dear Novice,

I want to have a go at some Triggers.  To update summary records of
accounting data.

I see in the reference manual
http://www.de.postgresql.org/users-lounge/docs/7.2/postgres/sql-createconstraint.html
it makes the comment:

"It is not intended for general use."

Does this mean that there is a problem with triggers I should be aware of?

Thanks,

Ben