Tactics for playing as the Dwarves.

I wouldn't take it, although it depends on the circumstances. Spending money right away for an unclear purpose (it seems to cost 1500 gold for the Dwarves) – just so that on the first week, two dozen bearded guys with minimal damage can shoot endlessly? The Fortress has it right away, but he also has Soldier's Luck, and otherwise, it's not very useful...
However, if a lot of archers appear at once, or if you really need to shoot at the beginning – when there are many slow, melee creeps around – then you can take it, the main thing is to pay it off quickly.