An interesting set of rules.
The command system is a bit like Fire & Fury, but you have one table for each type of troop: Imperial, trained colonial troops, Zulu, Pathan, Dervish, Boer. Depending on the tactical situation, your troops may or may not perform as you want them to.
Troops are also graded by experience (Elite, regular, Green) and equipment (3 grades for small arms, 4 for artillery).
A reinforcement system allows the numerical disparity between native and imperial forces to be represented, as not all native troops are deployed on-table at the beginning of the game, but appear on the table with a random roll. This also allows you to reuse casualties, meaning you need not buy a very big horde of natives.
As for figure requirement, the game utilises a generic 4-element unit, with suggested base sizes. All foot and mounted units are made up of 4 bases (when killed you remove a unit as a whole, not by element), and it does not really matter how many figures you put on one base. The author recommends you put the same number of figures on each base for consistency, but that doesn't actually affect game play. Generally I would say you are looking at a 12 to 16 figure foot unit, and a 8 to 12 figure mounted unit if going by DBX standards. Artillery and MG pieces are based singly, as are commander figures and ammo mules.
As for total figure requirement for a game, I give a summarised version of the Sudan scenario in the rulebook:
British:
1st Brigade -
1 Command figure
6 Infantry units
2 Artillery pieces
1 Ammo Mule
2nd Brigade –
1 Command figure
6 Infantry units
2 MG pieces
1 Ammo Mule
3rd Brigade -
1 Command figure
2 Cavalry units
Dervish:
4 command figures
20 melee-armed Infantry units
1 rifle-armed Infantry unit
8 melee-armed Infantry units start off-table
Overall I like the rules, but there are some typesetting errors as well as rule changes which gave me some difficulty initially. But the errata and changes can be found on the BFE website and their Yahoo group. Depending on how soon the new edition is coming out, you might want to wait while you paint your figures up.