Hey!
I used the Paralinx Arrow couple weeks ago... a system that is almost the same as the Aries, but costs like 800+ dollars. We went to shoot in a private neighbourhood, only houses, lots of open space, we were on exterior, outside the house on an inner road. We were shooting a "long take" (I dont know how you call it in english) so we were circulating a bit, but not so much. The Paralinx said it supported 100m of signal range, but that wasnt the case, we struggled a lot to get it working. And once you lose the signal it takes a while to get it back.
Anyway we werent close to the camera, but one figures it should work at that distance! Maybe in interiors or places where you dont move around a lot it works ok.
Other than that, when we got it working, it was a pleasure to have

Oh and on the Aries there is a PRO version which costs a little more and you have a lot more range.
Hope it was useful.
Cheers!