Electronic caller, any good?

[MarineStud]

I was wondering if either of these two electronic callers were any good:
Phantom Hunter Series Predator Digital Callor Preymaster Digital Call STWRT PM-1 Hunter's Specialties. any info would greatly be appreciated.

[psychmonky]

I just got the preymaster. I have only used it once, with no success but i dont think it was the call's fault. I did notice that if the connection wasn't just right between the two pieces of speaker coard, than it didn't play the sound. I had to fuss with this a few times, but i got it worked out now.