Mine shook a little bit when I first fired it up with a brand new CC 25 Brushless ESC/w- Parkflyer 370 4100 KV, TP 3Cell 1500MA Li-poly

After I plugged in the USB Controller and programmed the ESC with the new software update it d/l automatically, and
greased the gears, she smoothed right up. I also use soft start, not the Ultra soft start, just the regular soft start.

Ive got 20 or 30 flights on it, and it flys great. The only thing I don't like is the motor gets to hot IMHO.