sorry for the GAS 
yeah, I guess AE is somewhere ‘in between’ and also different, but in same price bracket as POM 400, and certainly in the category ‘budget modular’ which these are marketing as.
oh, me too…
I don’t want to change the system continually, but there is something to be said when building it initially to have choice … modular can be many things, to many people - the beauty is, you buy what you need/want, take it in the direction you have in mind. (and of course retain the possibility to change your mind later if you wish)
the AE complete systems are cool for that, like the POM, they provide all the basics (*) , so if your new you dont have to worry about what is required to work, its a balanced/thought out setup - but they still leave space to tailor them, if you wish.
I personally got the 2-row system on KS, and didn’t add any new modules for over a year, it was in the summer that I then decided i wanted to use it outside, so added the headphone module and multi-fx.
(ok, I admit , Iater added even more, but thats was my choice, I just wanted to explore more voices etc… )
(*) the complete systems are sold as package, but if you chat to Robert before buying he can be willing to switch things around, e.g. if you know you don’t need something in particular - though honestly, they are well balanced systems imo.
EDIT:
form factor, an interesting note… AE are going to be updating the case design, so you can get both bigger and smaller form factors - I don’t know when, but Robert is pretty quick at getting new stuff out after announcing 