I've got one. This is where mine lives when I'm flying. Sometimes it's antenna up, sometimes down, I've not completely decided which I like best. Right now, antenna down and somewhat curled back on itself to avoid the sensors underneath.
View attachment 4335
I've been very happy with it. Small and unobtrusive, with a long battery life. I've got it mounted to the side of the Mavic with Velcro and it's almost a pain to get it off. I've seen some interesting mounting options for the rear leg extender (which I have and usually use). Originally, mine was mounted on the rear half of my batteries, but someone on here made the observation that removing it each time to change batteries is just more options for damage, loss, whatever. So, now I stick it once, and leave it for the duration.
I've tested it only really at short range...a couple hundred feet...but I'm confident that it's been around long enough that the published range is probably pretty close...and all you need to do is get somewhat close anyway.