I normally only play with 20mm plastics and a couple of really old 25mm hinchcliff armies, on 8' x 6' boards - which can be a hassle as one of my regular opponents is wheelchair bound & can't strtch to het middle!
so we try to get table-tennis tables when we can - 9' x 5'.
The game plays very well - although I don't have anything much to compare it to having not played 15mm anything for a few years.
But we are going to have a 15mm game in a couple of weeks, just for the practice.