[Imp]

Must admit I would find 30-60 units restrictive.
Will play any size from 20 units up but probably 80-120 is the norm.
Bigger just equates to larger maps & longer game turns 200 units is no issue with the following exception much along RightDeves comment.

Large scenarios especially if using modified units unless they are well structured it just takes to long to identify what you have & where.

Yours are no problem & I will give SAS Troop a nod for his being easy to get to grips with despite often being quite large.