Has anybody used U S CAR TOOLS

huh? how you going to put them in? i am a welder it is not an issue for me to make them, i like the uscartool connectors more than box tube poking up through the floor. it was a tuff decision because it is a big difference in price, but he gave me a good deal on 2 sets at carlisle. either way will work but i think the uscartool is the strongest way.