Hi Jamn,
I have only used body bars at the gym and found that the lighter ones worked quite well. The only problem with the heavy ones (30lbs. +) is that they get quite thick and I find it difficult to maintain a strong grip (I have relatively small hands). I looked into getting body bars for my home workouts before buying a barbell, but I found that it would get REALLY expensive because I would have had to get about 10 bars in order to have all the weight incraments that I need. The body bars get more and more expensive as the weight goes up, and I was able to get a good barbell with adjustable weight for a fraction of the price of one of the mid-weight body bars. I tend to go pretty heavy with my weight for excercises like squats, so it would have been a huge pain to have to buy body bars for every incrament between 20 and 60 lbs.
Having said that, if you tend to work with lighter weights, body bars may be a good option.
Let me know what you end up getting!!
Take care,
Ady