I've been using four Terra Nova 2g stakes plus two 8g Ti shepards Hook stakes for my tent this season. The tent is freestanding, but I get more floor area when I stake out the four corners, so that's what I use the 2g stakes for. The two 8g stakes are for staking out the vestibules and for creating pilot holes should the ground be too tough to penetrate for the 2g stakes.
I've been happy with the 2g stakes. I sharped the end to a dull point instead of a flat end so they penetrate the ground a bit easier. I've never bent one yet nor needed to use the heavier 8g stakes to create pilot holes. It seems that the 2g stakes will only be a problem if:
1) The ground is very hard and you need to hammer your stakes in. This can likely be solved by carrying 1 heavier Ti stake too.
2) The ground is too soft and the 2g stakes don't offer enough holding power.
I wouldn't use these stakes for the ridgeline of a tarp or other high stress applications. They would also be a disaster on soft soils and sand. Besides that, they seem to be a good choice for non essential applications.