At present, with a well placed UAV near a large cluster of enemy 'mechs, this will allow you to gain literally HUNDREDS of bonus experience per match, which adds up rapidly. UAVs are now your best friend when trying to master a chassis, off setting the Cbill cost greatly.
On top of that, the UAV consumable when fully upgraded is extremely useful in general, and is frequently seen at all levels of play. From allowing solid indirect fire to countering ECM bubbles, it's a great consumable to pick up.
Until recently I recommended these for serious league minded pilots only. Now, I endorse them for anyone looking to help their XP grind along. Absolutely worth the module.
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TL/DR:
1: Upgrade your UAV with GXP as soon as possible to it's full ability.
2: Find the largest concentration of enemy 'mechs possible.
3: Drop the UAV every match.
4: Watch the XP roll in!
EDIT: Also, remember, you gain extra XP for every LRM 'mech that uses your UAV for indirect fire, so these rewards can get even higher.
Edited by Victor Morson, 03 December 2013 - 01:57 PM.