Aside from the egronomic benifits of a grip, my favorite advantage of the one I have, is the ability to use AA batteries. Old camera from the film days, the specialized battery was expensive and sometimes difficult to find. (some, mayby all) Canon grips allow the use of two rechargable camera specific batteries, or AAs. Likely the other manufactures do too.
|Blue and yellow in water by fireplace33|
from Ink and water
|Kylmä joki kopio by Kaappo|
from Shutter speed 1/25 or slower
|WR_2.8_13 copy copy by photoprof|