I like both locations of this store. I like that nearly any fabric you want to find you will find at G Street fabrics. Anytime I've gone there looking for specialized items such as types of fasteners or a strip of fur trim or a special button, they've got something that meets my needs.
I've found that their staff is quite knowledgeable and willing to let one browse or give more in-depth help.
The only thing I don't think I've seen there is logo fabric -- if you're looking for Dora the Explorer to make something special for your grandchild, you'll have to go to Hancock' s or Jo-Anns.