I've been on the search for a new helmet and was looking at one from Specialized with the ANGi sensor. Interestingly, an online shop I use a lot gave one price, and I also came across a link where I could also buy the same helmet direct from Specialized for the same price. However, upon further inspection, the online shop includes the sensor with the helmet and buying directly from Specialized forces me to buy the $50 sensor as an add-on. May be a one-off, but seems like the direct model won't work too well for them.