We bought the 1450ZLT to work on our fitness performance before summer. This treadmill has a nice, commercial design and has a heavy-duty motor that runs the belt effortlessly regardless of the speed. It's a heavy piece of kit and feels very stable in use and its cushioning makes it very comfortable to run on. We don’t use the iFit at all, as we usually go for manual control workouts . The console of 1450ZLT is very easy to navigate and we can change the speed and incline quickly when needed. This treadmill is perfect and we would definitely recommend it to all fitness enthusiasts!