Compared to a non-booster setup, the booster type will allows feel spongier. Even so, when the brake system is bled properly a booster type will feel fine

One simple test you can do is: With engine off, pump the brakes until the booster loses vacuum. The pedal should get higher and tighter with each pump. All sponginess should go away after four pumps or so -- which indicates the brake hydraulics are OK. If it doesn't remove all sponginess, re-bleed the brakes