Pioneer gives you about 1500 extra EXP in a good game if you don't die.
Closer to a reliable 1000 extra EXP if you spend a lot of time respawning.
Seems worth it to me, judging by the sheer volume of matches you WILL play to max out every other specialization. --- Is there something about the way I type that makes it sound angry? Maybe it's just something about the way you read.
I figured 343 was going to release some impossibly high ranks at some point, like in Reach. The highest rank was Lt Colonel for a few months, then it was expanded to Inheritor. And if more perks came with those ranks then getting stuck with a lame title wouldnt be an issue. --- "The most important thing is to never stop questioning." -Albert Einstein. Xbox Live: AlteraLateralus