does anyone use this? how do you like it? I just ordered one & am going to order some Nike Air Max 180s to go w/ it....I sometimes focus on lifting & not so much cardio, so I thought this might help motivate me to run more. I used to be able to run 1-mile in the high 4 min.... like 4:50-4:55... I'm probably like 6 minute miles now, so I'm gonna work my way back to that. I'm about 6'1" 195 lbs now...wouldn't mind cutting just a little before spring.