An interesting system is in development via Kickstarter for video professionals to get excited about. The LineCam can most easily be compared to a zipline style "track" that can either be operated through gravity (with the Glide) or via remote control (with the Flow). The devices themselves appear to be very well designed and prototypes have already been used in the field by the GoPro Media Team, who had this to say:
"We had the chance to use the prototype LineCam System for the production of the GoPro HD3 product launch video. We are very impressed with the amazing shots that this system enabled us to achieve. Several things stand out, the ease of use, the quality of footage that we were able to achieve and the over all quality and thought that went into making this system are top notch. The first thing I noticed when I unpacked it was how well thought out the system was. Everything from the tensioning system, the pelican travel case and the custom cable clamps were spot on. Huge contribution to production capabilities and we look forward to getting our hands on a production unit when they become available."
Travis Pynn - GoPro Media Team
Overall the product seems like it could do very well under the right conditions, although personally I believe it will have problems with windy situations due to what appears to be a lack of a stabilization method so far. If that is resolved there doesn't seem to be much that will stop this product from doing very well.
The creators, Nick and Larry Braun, have put together quite a bit of information on their Kickstarter page as well as several videos demonstrating the capabilities of their system.