I have a Back Country Access Tracker 2 luckily I haven't had to use it yet (knock on wood) it is really easy to use all you do is turn it on with the switch and if need be to put it in Search mode you just pull the toggle down on the bottom.
The tracker DTS is the original and also very good but with its push button search design if you hold the button too long it will switch back to transmit and in a rescue situation every second counts. Plus the Tracker 2 has an increased search radius by approx. 5 meters again i know 5 meters isn't alot but like i said before every second counts.
The Tracker 2 is also easier in multiple burial searchs but i won't get into that in detail cause i could be here for days on how it works.
The best thing is to take a course not only do they teach you how to use the beacon but they teach you how to evaluate snow conditions, and the best way NOT to get in an avalanche is to NOT go into hazardous conditions at all.