Garmin Alpha 100

I dont know about all of you but my money is limited and I cant see how are why anybody would need a unit that does anything more than the 220 are 320. All I need is to know were my dog is what he is doing and how far he is away from me. These two units do a excellent job of that and I perfer the 220 . The shock thing might be nice but I aint got to have it and for the money I will just keep my old shocker I got. Everything else is just bells and whistles and them trying to get that money but then again aint that what its all about in this world these days. They wont get my money my unit does all I need and more . They have done gone a little over kill now .