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Speaking for I, me, myself personally, I can't wait to get me hands on them.
Four boxes of each, likely mixed and matched within them and a bit with Zvezda's Macedonians and linear b's Mithridatic heavies with seven (most likely) or perhaps six to a rank and two ranks on a 120 mm x 40 mm base (a left-over from Impetus that I'll use for Lost Battles; and whatever other system I may use).
For Successor stuff I'll limit myself to two bases per unit, I expect, but may go to three if there are only phalangites on one side of 'the argument'. Lost Battles is agnostic to basing, so it's purely about the effect and preference.
I'm also happy to have the shabby, pointy-fighty ones (to expand on your wonderful expression 'Babylonian') as I like the look of them and you get a nice 'push of pike' on the table. With similar poses in my Great Northern War figures I have interlocked them or set them up with pikes above or between other troops for storage.
As with everything, I appreciate that what may suit me may not suit others, but they look like they are gonna be the cat's guts as far as I am concerned.