Even Zeta's attractive price is going to run collectors $350-ish for the set. That's still plenty enough to give me pause when I'm not 100% sure it won't be a regret-purchase down the road.
I'm not an FT ass-kisser, but I've learned to never count them out. Their stuff usually changes substantially for the better between renders and release. Thus, either their Aerialbots/Superion will look better, and I'd regret buying Zeta, or it'll look worse, but it's very existence will push the price of Zeta's product down further, because FT fanboys.
And Zeta being a rebranded Toyworld offshoot has a history already of producing upgraded v2 figures. I'd be piiiiiiiiiissed if I bought individual v1 Constructor figs only to have a fixed v2 boxset with extra G1 parts come out for cheaper just months later. Mega pissed.
I see no scenario, other than the collecting addiction dopamine hit, in which it's a good idea for me to buy Zeta now. I very well might own him later, but it'll be an informed later, not a just-because-it's-out now.
Truthfully, you could make this argument for any figure, but the problem and risk are exaggerated when you're talking about five proprietary-combining figures. If I jump on the wrong Kup or Springer, I'm out $75 and enjoyed it along the way. For some reason, I can't feel that nonchalant about a $350 combiner. Dunno.