When the jr hv servos first came out I put them in my buggy and truggy and within 3 races I had one fail so I ripped them all out and went with the 7950/7940 from hitec. They have worked perfectly. I do have to say the jr servos are very pretty to look at but they either work or don't right out of te box. Look at the pro guys most of them run hitec servos there's. Reason for that.