I've got the Node 2 and it's been on the fritz for the past couple of rides, i.e. returning really erratic speed readings. I put new batteries in both the head unit and the speed/cadence sensor and it didn't rectify the problem, however about 2/3 of the way through my last ride it started reading seemingly correctly. Prior to apparently fixing itself it would return speed readings in the mid-80's, average speeds for rides in the mid-30's, etc. I checked and double-checked the wheel size settings and the positioning of the magnet in relation to the sensor and everything seemed fine, so I really have no idea what was causing it. Anyway, prior to these problems I would have recommended the unit but I'm a bit leery of the build quality now.