I need a training collar for the fiance's great dane/ shepherd mix. I have a tri-tronics for my bird dog and love it but she doesn't want to spend a lot since it's only for around the yard. I have been looking at the sportdog fieldtrainer 400s collars, but am kind of reluctant since I don't know anybody that has ever used the sportdog collars. So to make a short story long, have any of you guys had good luck with the sportdogs? Thanks for any info.