This is the 3rd one I have purchased, these hubs are unreal.  I have 3 external WD 1.5 TB hard drives hooked up, my cell phone, an ipad, a bose mini speaker and a keyboard. Hooked up to a Sony VIO laptop, and everything works without any lag time.  I also have one hooked up to my server with 7 external hard drives, also no lag time.  Very, Very Impressive.  Highly Recommend!!!