If you need a small treadmill and aren't planning on doing serious training on it, the Evolve unit makes a lot of sense.
If walking is your prime pastime and running and jogging are distant ambitions then a low end offering like the Horizon Evolve SG might catch your fancy. If you can spare a $100 extra go for the Horizon T101 that won the Best Buy Award in this price category. An impressive machine that is so small when folded (10" of vertical height) that you can literally put it under a bed. If you are someone who wants serious training, look elsewhere but for $600 and if you need an ultra-compact machine, this one makes inordinate sense.