Yes, they work very well.

I would put it at the best bang for the buck ESC on the market.

Features:

One Push Set-Up
Power MOSFET's for Low Power Loss
Hi-Frequency(1830Hz)
Adjustable Current Limiter
TEMPFET Circuit Protection

Operating Voltage 4.8 - 12.0 Volts
Current Limiting 20 - 120 Amps
Forward Current 300 Amps
Braking Current 100 Amps
Internal Resistance 0.00112 Ohms
BEC Output 6 volts / 5 Amps
Size L x W x H 1.6"x1.2"x 0.7" 42 x 30 x 19 mm
Motor Limit 10 Turn
Weight 1.9 ounce 53 grams