Their strength is in the sheer size of their divisions and brigades, and the fact that in mechanized infantry divisions, the platoons have vehicle support at almost every level. The squad-level APCs are too annoying to actually game with, but you can represent a proper SLDF infantry company by including a lance of vees with them, a well-armed large APC for each platoon, and a compatible combat tank as the fourth unit in the lance. Seven combat units makes for a solid force, especially if we're talking about Maxims backed up by a Zephyr, or Turhans backed up by a Demon. And of course, there's the mech units integral to these divisions as well...