Save your money and for a better, cheaper surface mounted pick up get the AKG C411.
A friend of mine bought a Carlos system (the VIP, which includes a sensor) and actually has a Youtube video demo-ing it. These days he prefers another system and has some very 'interesting' things to say about his dealings with Carlos and his pick ups, there have also been numerous discussions about these on Facebook with various guitarists I am friends with, or friends of friends etc. The same things keep coming up:
*questionable endorsements - often by guitarists who may be simply photographed/vidoed trying them out and later are found not to be using them in concert.
*recordings with said guitarists which are obviously miked up as well - you can't tell whether you are hearing the pick up or the microphone from the recording device/mic
*sourcing of cheap transducers from China, and re-packaging these in new, sexy black cases with Carlos logo, freenail file etc, and adding a few hundred $ to what they actually cost