Up until this morning, I had always run my Asuga on 4s, and I was happy with it. This morning, I decided to put a 6s battery into the Asuga for a quick 5-minute run in my front yard and asphalt driveway. The 6s really woke the Asuga up - it's great on low cut grass, and it is so much more stable at higher 6s speeds than either my Radix6 or my Muraco on 6s. I'm in agreement with Razor RC, where he says in his video it's the larger size that makes the Asuga more stable. I'm anxious to run the Asuga on 6s in my backyard, which as a combination of grass and dirt, to really push it to the limit.