I regret not buying the GH. they look really cool and all but i just find $7.99 for these little guys to be a little expensive. same with the titaniums. i got 2 from a secret santa and relaized just how cool they are but lack of space tells me to hold off of them.
On the reverse, I actually regret collecting the GH sub-line. I started with the second wave and it took me a while to go back and get the first wave. I decided not to get the ships, but did want to get one of each figure, which isn't so bad with waves of four 2-packs at a time.
Then came those massive Battle Packs.
I don't mind getting a bigger chunk of figs at a time, but when most of the wave is all repeats, it really blows re-buying figures that you already have. I bit on the first few of these, but have passed on the WM ones, which arguably have nicer, more new figures than their predacessors. I'm also running out of room and suddenly have like a hundred of these things!