I just recently started doing my legs and I bought the Squat Hip Belt sold by IronMind. Really does work the legs hard. Its not a replacement for normal squats, it just another excersise to add to your legs or take a day off from squats and use it.
Blasts the thighs really good no lie. It is awkward though because you have a barbell swinging between your legs. It forces good slow form though to minimize barbell swing. It also is very hard, you will be able to life wayyyy less then normal sqauts.
Just putting it out there for you guys, its a good option.