I have a half-length (82') of the poultry electronet, and also a full section of the sheep electronet for my sheep.
I love it as long as you are prepared to cater to its idiosyncrasies. Which are that you ABSOLUTELY MUST keep the grass TOTALLY SKIMMED DOWN TO THE GROUND all the time (even moreso than with the sheep electronet, b/c the lowest wire on the poultry net is lower and thus always closer to grounding out), and you will need to add additional step-in posts and corner tiebacks if you're in a location where it'll be exposed to wind. Also it won't really work in the wintertime if you get a buncha snow.
It is quite easy to move (to relocate, or to move over and mow the fenceline and replace the fence where it was), you just gotta DO IT when it needs it, not say "oh well maybe I'll get to it tuesday or something like that".
As with any electric fence it requires a suitably sized charger (takes a bigger charger for a given lenght of fence than some other types of electric fencing do) and you have to install it correctly with good electrical connections and use a GOOD fence tester on it frequently, preferably daily, to make sure you detect and fix any problems.
Chickens can certainly flly over it if they want. Whether they will want to is pretty unpredictable, altho the greener and more-interesting "inside" is, the less they tend to exert themselves to explore "outside". Mainly tho it is for keeping dogs etc out, more than keeping chickens in per se.
Personally I think it is useful for the chickens and the best thing since sliced bread (and what's so great about sliced bread, anyhow?) for the sheep. But ONLY if you keep the weeds down and use extra posts/tiebacks as needed.
Good luck, have fun,
Pat