My shammy 4 man dinged 70 about 3 days ago, having spent about 10 days at 69 (and twinked a bit for it). Yes it was good for marks, got about 70 AB and 70 EOTS out of it, and the practice was useful. However, today it's AV weekend in Europe, and 4 hrs in and out of AV has earnt me as much honour as those whole 10 days did..... So if you're considering "twinking" at 69, my advice would be don't bother, speed to 70 asap and start getting those upgrades as soon as you can.