I have one, any sound can get them to start coming in, but the freq will get them to act differently than I have ever seen. I had issues with the first 2 they sent, this one so far is perfect. Yeah it is made in Taiwan. I can live with that. When I called to return it, I got no run around, they asked lots of questions and even paid for the return of the units.
The first 2 the batteries didn't last, only got 3 or 4 stands before I had to change the spare battery which was included in the cost.
The first 2 had remote issues that I believe have been fixed, they would go to off if it was bumped on the right side. They had range issues. I haven't set this out to see how far it works as I usually place the caller about 50 yards away.
The sound files are wav files only, any sound that is a wav file will work on it. Unless things change as they record new sounds on ultrasonic they are on the website FREE. Easy as can be to download and update.
The cost seems high, but if you consider that other companies that sell caller sounds charge from $3-10 per sound and have a new sound to sell every 30 minutes or so. I have been a TT subscriber for years and I promise you I probably have $7-1,000 for sounds that after awhile start to sound just like the sound that someone else sold me. I know of at least one company that abandoned one of the other caller manufacturers and is now recording or converting sounds to wav files.
I hope the cost is high enough that every wanna be predator hunter keeps buying the cheap versions and get discouraged then throw the caller in the closet and stay home to watch tv.
Whether they are worth the dough? I know they are dang sure unique and when I had a problem, they had me another unit in the mail without proof I was sending the other unit back. I guess that is part of being the benefit of buying the first that was for sale.