I bought the usb to update my LRP SXX V2 now . I should have bought the Tekin a couple of years ago, but too late for that now. I chose the LRP so I wouldn't have to add the external boost or battery. I run the races , so I don't have any spare time to prepare cars. I'm lucky to throw them down and race and hope things stay togethere. I guess a couple of seasons out of electric racing and I've turned bitter about the cost. Don't condemn me for saying , but gas is where it's at. I love the way the pan cars handle , and with good speed , they are great fun to race. I will try to pick up the right equipment so I don't have to repeat this next year and me and my empty pockets will cowboy up and race. Sorry about the sour attitude, I'll get over it as soon as the flag drops on the next race.