There appears to be 3 big hitters in this market. I'm looking at one of these three models and want to hear what you all have to say. The one thing I can't seem to find an answer to is what is the beeper delay time? Thanks in advance. Tri-Tronics Sport Upland G3 or Garmin Delta Upland Sportdog UplandHunter 1875 Dogtra 2500T&B Training and Beeper