Totally solid with an ideal angle to get a vacuum robot over the toughest thresholds. It has a longer runway than most - you'll find that is often needed for higher thresholds. Extremely solid and well made. Well worth the price.
This rubber doorway ramp/wedge is exactly what I was needing. It is sturdy. Only one thing that has stood out was it had a couple of fine cooper wires protruding from this wedge.
I read one review regarding this product not working with Roomba type vacuums. I have a Roomba series 6 and it works well allowing vacuuming to kitchen which had a high threshold at the entrance.