It's a good idea to have models in different scales, though it is perhaps more useful to think in terms of the mesh complexity as well. As I've seen it described, 1 Poser-unit is 96-inches, or 100 inches if you want to simplify the arithmetic. So your 1/10 model would have 1000 inches to a Poser-unit. Or about 25 metres. Have a fiddle with the translation dials and you'll see this. Poser uses a bit of a different scale, and more decimal places, than other modelling/rendering programs, which has implications for importing and exporting.