I "lost" my Tri Tronics a couple of years ago and replaced it with the then current Garmin equivalent. I hated the Garmin for a variety of reasons; the principle one being that the transmitter needed to be charged as well as the collar. When the Ford dealer called and said the shop foreman showed up with a Tri Tronics transmitter that he thought had come from my car I was thrilled. I haven't used the Garmin since!
I find the beeper to be the most effective and very seldom use the shock feature. When my dog hears the beeper she comes on the dead run. I seldom use the shock feature.
I run a Boykin and really have no need for the many features available on the newer collars.
R.