I have the ofna 10258 12volt giant motor starter box. I bought 6 years ago.
I race every weekend, I use it to break-in all my tight motors to include my
nova rossi .21-p5xs. I own four starter boxes and it's by far the strongest. It still has the original battery that will last for about a month of racing with no
charge. It has never let me down. I am about to buy the ofna 12volt chrome
top 10250 starter box. IMO ofna makes some of the best starter boxes. No belts or pullys to break!
p/s I'm not to crazy about their buggies though.