In the cockpit it should only be used on a tablet or a dedicated EFB.
You must not rely on it solely to print your entire charts for the route, because you can never tell which charts for which airport you will need (see evergreen at LHR).
I see only a few ways it can be used effectively:
1. With an EFB or Tablet. If you use a tablet that is not certified, know the risks, like power outage, hanging on to it in turbulence, difficulity to read it well in direct sunlight etc.
2. As a supplementary to a paper set, like to print an extra copy for the other pilot to use of the destination only.
3. If fly a limited number of relatively short routes, that have only 20-30 airports along the way. Then you can spend the time each update to go over this airport list, and check for updates and print them.
4. At the office, to be used in flightplanning, performance calculations etc.
The charts themselves are excellent, and you can print it on any size paper, so your can enlarge crowded procedures and airport layouts.
Recently added electronic text is great too.
Support is also good. I had a problem with a disc, wrote them an email, and got a new cd 48 hours later.
If you are planning to print a lot, better have a good stock of printer cartridges, especially if you plan to do it with a portable printed on board the a/c.
Good luck,