Wiedenmann Terra Spike XF6 vs Verti-Drain 2216 Bullet & Toro SR72. All machines were set at 7" depth, 15 degrees heave angle, and 5"x5" square hole pattern. The Terra Spike XF6 was able to travel at 2.4mph. The Verti-Drain could only go 1.5mph. The Toro (Soil Reliever) could only go 1mph. The Terra Spike XF6 wins...hands down.