Just down loaded the 100k Tassie Topo maps on to Memory Map, they work well, some areas are not up to date, but that is easily fixed. I just used map my ride and put those missing roads in, put them the same colour!
One thing I did do was spend the time it zoom in and down load the hole of Tassie, by just moving all over Tassie. Now I have done that it is as quick as the 250k map & if you do find a missing road it is so easy to switch back and forward between maps.
2011 Triumph Tiger xc
Do what you want to do, buy what you want to buy. If it doesn't work try something else