Following this thread with great interest.
There are two main line, one made by Jin Jia Cheng and has a lithium rechargeable battery in the reciever JJC W100 but not sure how reliable this really is and whether the battery will be reliable and replaceable...
The other has two replaceable batteries and 16 channels .
Having a wireless infra red trigger has been fun, albeit largely unsucessful thus far, but a 100m trigger has enormous potential. However I am a tad reluctant to leave my 5D and L lenses 100 meters away from me, thats a good head start!
At £15-£20 I will be getting one not sure which yet but was interested in others input.