Undefeated at what? Never heard of Gens Ace Before
I never heard of them either but my LHS had some and said they were really good for the money. I bought 2 5000mAh 40C hard case and they rip ! I'm going to get a couple more. We just bash so they are more than enough. My son and I do plan to race so hopefully the two Gens and the four other LiPos we have will get us through a day of practice and racing.