My first chrony was the origional type with the works in the chrony. The thing I didn't like about it was it was really agressive and I had to shoot it ,lightly, several times. Each time it tamed down for awhile and worked good for awhile after. Kind of like when I used to shoot my German Shorthair when he flushed pheasants out at 100 yards. A little dose of lead made him into a pretty good dog.
Well, one day that dang chrony really got mean and I had to put a 30-30 round right through its brain. It saved me from a mauling by that chrony but the bullet in the brain killed it dead.
I called chrony and they told me about the master chrony that had the works at the end of a 20 foot line. If you had to shoot it there was a much cheaper cost to replace the box.
I had them send me one and it worked pretty good for many years. One day I was testing some Hornet loads from my 10" Contender when that master chrony started gettin mean. I beaned it once, right accross the box and it stopped its attack but the very next shot it charged and and I had to kill it. I still had the works though and for $40 total, including shipping, Chrony sent me a new box with new sky screens and that included a set of plastic deflectors for when I shoot my muzzle loader. They were an extra $10 so I guess the box itself was only $30.
This last one has been pretty tame. I think they told it before they shipped it that I was quick to shoot when I feel endangered.
Anyway, I would have to say that I have liked my chrony but I would suggest that if you get one, get the master chrony.
Sixgun