Runnergirl,
It's perfect for women who are doing Cathe's workouts at home because the bar is only 4-ft. long and weighs only 5 lbs. Therefore, you can go as light as you want, but it can also go up to 55 lbs., which is more than enough for working out at home without a spotter. As others have mentioned, the plates are all rubber-coated, and won't scratch or harm your floors, or make any noise. You can buy plates anywhere from 1.25 lbs. to 10 lbs. All in all, it's just a high-quality set, and it doesn't cost very much more than other sets, so it's a good value too.
If it weren't for the shipping cost, I think it would be a better value than the walmart 55-lb. set, which is not quite as good quality. But many people here can buy the walmart set at the store, and save the shipping, so there's a significant price difference. Most people have to buy the Troy Lite system online.
HTH
ETA: I just read that the 5-lb. bar can hold as much as 80 lbs. Wow! Maybe they've upgraded it since I bought it. I noticed that the price went up a bit too.