I was so stoked for the first 2 sessions! The third go out the heat coming from the suit was quite a bit less and the vibration for the different heat levels was significantly decreased as well. My first two surfs when I changed temp settings the whole board would vibrate! Last time out I couldn't even tell if I was raising the temperature setting. I was pretty excited about this piece of equipment for daily winter surfing. I'm not sure if the battery was defective or if the connections from battery to suit were leaking juice and to where? Yikes! I'll be sending it back tomorrow. Bummer!!