I use the A1 foamboard from Hobbycraft and yes, it's noticeable heavily than the Adams board available in the states.
My simple cub fly's quite well, but it's about 50% heavier at its flying weight but it does cope well with wind and I get about 8 -10 minutes on a 3S 1500mAh battery.
Using a 2212 1000KV motor swinging a 10x4.5 E prop