Very interesting thread. Chris Crawford should have made his post in the humor section, as I think he meant it that way. Hell, he wouldn't want to break an ecaller hitting a coyote over the head anyway. On a more serious note, it is the combination of hand calls and a well positioned ecaller that does the deed the best, especially hunting by yourself a lot. As far as spreading scent, etc., that Tony Tebbe was mentioning, you won't do that if you know your country good enough to make the right approach, and drop off the caller on your way to your nest. A lot of the answers to this subject lie in where you are hunting also. I hunt a lot of those PhD coyotes like old Gerry Blair used to write about, and the high quality electronic callers are a big time asset in that case. You'll probably call just as many in with hand calls if you are really proficient with them, but there is no way you can make the coyote show up exactly where you want him to with a mouth call by itself. Now obviously, that covers the big majority of situations, and it is my opinion, not written in stone. Late in the calling season, when the alpha males and females and the semi educated yotes have heard a great variety of attempts by hunters with mouth calls bought at WalMart, the true sounds of a good ecaller, combined with decoys, scents, and proper placement away from the hunter increases your odds of success many times over. Finally, if you have your "Nest" located properly, the odds of you seeing the coyotes you call in are much greater with a well placed ecaller. Hell, I have had several coyotes nearly jump in my lap when hunting alone using only a mouth call. I made a quick decision that I didn't like that much. If you are wanting to make a pack or a big pair think that either a pair of strangers or even a pack of strangers has invaded their territory, the combo of several good mouth howlers and the howls off your ecaller placed 75 to 100 yds out is something you can't imitate with mouth howlers alone, unless you are an expert ventriloquist.