4 batteries, 2 chargers and a Honda EU2000 generator makes for nearly continuous flight. I've been shooting from campsites for months now and have no issues using the EU2000 or the Onan 5500 in my trailer to keep the batteries topped off. If one is looking to do a lot of flying in remote locations, it would be better to invest in a generator first than one of these chargers. In any case, the convenience of charging everything all at once does look appealing.
As a cautionary reminder, I would recommend not charging the remote too frequently. For example, charging it after ever four flights would likely be too frequent. For the health of the battery you should let it discharge more fully before each recharge. I was in the habit of topping it off after each 3 or 4 flights but the series of shallow cycles caused it to develop some battery errors rendering it useless. I was able to get it back after doing a full discharge/recharge cycle, which takes forever when not flying, but if one has some paying work lined up, they will be pretty disappointed to find their poor charging habits have rendered the unit unflyable.