It was one of the 25kg ones - I was also swayed by the independent testing I saw someone do on youtube. The servo I bought indeed seemed plenty strong as fast - well within what I expected based on the specs. Like I said, the problem was it died immediately the first time I had it at the track and when I posted a negative review on Amazon they tried to bribe me to take it down. The ratings you see on Amazon are almost certainly not a true representation of what you actually get.