I use BioLegend almost exclusively for all my antibodies and I highly recommend them. They are less expensive compared to BD and they have a lot of the same antibody clones as BD. Plus you can purchase small aliquots and not spend a lot of money.
I agree with Tom, they are a very reputable company used by numerous laboratories and I have used them in my current and previous labs I've been employed to work. They offer quality antibodies and usually have customer appreciation perks such as a free complimentary antibody when you publish an article using one of their products.