I have recently traded in my TT Sport 60 for the new SportDog 2400. They are awsome xcollars and about half the price of the Tri tronics and as good. They have a Lifetime Warranty and customer service that is the best on the market. Check out their web page
WWW.SportDog.net and got the RTF and check out SportDog reviews in the product section. They are a division of pet safe products and sponsors of the Super Retreiver Series on ESPN. You will not be disapointed.