I'm new to this site. After hearing all this about the React Pro, maybe I won't bother to purchase the download kit. This is my second DC, lost the first one but thought it worked well enough to spend another $250 on the same computer. I did have problems with the Temp. always stuck at 54* while in the water, with the first react pro. The new one seems to work correctly. The ascent rate is still ultra sensetive. Just moving the computer up in the water will make it indicate in the red zone. I've blown almost every ascent rate according to this computer. Besides that it works.