Compatibility has always been an issue, and is why they may be of some use to me. The small number of halflings I've already got are all over the scale. These look like they would fit with some of the middle-sized old halflings I have from Citadel and Grenadier, and maybe some of the (newer) ones from Goblin Factory. I don't like the style of these as much as the Westfalia figures, but again -- they look like they match the style as well as the scale of those other figures I've already got.
Not necessarily building an army, but maybe I can at least round up enough of similar scale for a militia unit now. If not, they end up as civilians, either in the towns/farms or guarding the baggage -- similar to some of the human civilians.