This week I've been doing what I've seen many like-minded achievement hunters doing... riding the 6x XP event in Gears 2 for absolutely everything its worth. I've successfully paired myself up with boosting groups on a couple different occations. The rewards for boosting have exceeded my most optimistic projections on how far I'd go during this event, and I'm not done yet. I've gone for rank 57 to 76 at the time of posting, going from maybe 700k experience to around 2.8 million XP. Clearly I still have a long ways to go, but I can't even begin to count the number of normal play hours this has saved me. Even normal games are more fun considering how much XP is doled out.
As I type this, I'm in yet another boosting session. I will see where it can get me tonight, as I will not be boosting tomorrow (we need to record the next episode of the Podcast.) Then, I'll give it a go on Saturday night if I can find a group, as I don't work Sunday. I may not be able to boost on Sunday as I'm going out of town for Fathers Day. If I can get to about 3.4 million (50% of the total needed) I'll call that successful enough, and hope that there will still be people looking to boost this the next time an XP event rolls around.