Had a look too, looks good and if it works on the android or Iphone it could be useful - but not totally necessary.
At the moment I print a jobsheet the night before, at the same time I'm updating the days work just done.
The jobsheet gives me most of the info I need, and the notes let me know if I've got to ring or text anyone for access. During the day I've got the netbook in the van - if I need any other information.
To be honest, at £120 a year, I can't see it's advantages,
Dave