If you're thinking about pvping with a rogue (hinthint) or another non-healing class, investing two points in improved dampen magic is worth it. At the very least, it's another spell that the other team is gonna waste time dispelling.
yea the spec i linked is mage/rogue 2300 bracket
Because if you go against a druid/warrior, druid/rogue, you're not gonna get dispelled.