I don't know anything about the mini's but if you want to get a good quality customizable electronic caller , get a foxpro there very good, on the other hand if you want to be able to vary the sounds and dont mind practicing and learning,then i would buy a couple mouth calls maybe a dvd or two. to help you learn faster.
good calls ( Randy Anderson calls, and even very simple distress calls such as:the rabbit in distress circular call)
There can be too much of a good thing with antler rattling.
I like to hit the horns together for a good 30- to 40-second rattling sequence and then hang them up and resist the urge to hit them again.
This works to the hunter's advantage, because if a buck has heard it, he may have been 300 or 400 yards away and he comes in and he's not exactly sure where it came from.
When finally is time to rattle again throw a slight change-up into the routine.
The second time, don't rattle as loud...