Absolutely love my 1825! SportDOG truly does make the best training collars on the market today. I've been a pro trainer for 5 years now and have used SportDOG collars since I started. Before SportDOG I used a Garmin/tritronics collar that was OK, not great by any means. I go back and forth between my 1825 and 2525 SportDOG collars. I like the 1825 better for hunting because of its smaller size and the clip on the back. Over the past 5 seasons I've hunted anywhere from 60-125 days per season. The 1825 comes with me every hunt and has never let me down. This collar is reliable with its stimulation, has GREAT battery life and is super easy to use. If you have a super stubborn dog you might need the 2525, it is a little stronger of stimulation. But over the years I've found the 1825 works for 98% of the dogs I've worked with. Buy the 1825 now!