What did you use a the slider? Did I notice a bit of vertical movement (wobble) on some of the shots? Although seemingly simple to work, they do take a bit of practice to get the technique perfected. It's simple things like decelerating to a stop as you reach the end of the track, and ensuring uniform movement inbteewen. It alos helps to be creative in positioning and use. For example a great shot of architecture is to angle the camera at say 60 degrees to horizontal as you move the slider forward. For people, an interesting shot is to position the track at a 45 degree angle to the subject. I also find that the best shots are achieved with a subject in the foreground to give a sense of perspective.