I also like the current model.
That line states how the wrangler is less cheaper then the controller (which comes with the sentry mod).
You can use the controller to directly control your sentry from the spawnroom, it is not limited by distance.
However, this doesn't mean the wrangler is limited by distance.
The distance the raycasts can travel is about the same as the laserpointer (one side of the bedroom to the other)!
However, with the wrangler you can't just aim at anything form every place.
To get a good shot with your sentry, you have to get into the open for a bit, thus making you vulnerable.
Not the case with the controller.
tl;dr
The wrangler is not usable when in a well built spawnroom, the controller is.