What is your opinion on vertical grips?

iHedo wrote:

My lenses are heavy but when I put my vertical grip instead of feeling heavier I felt it more balanced. Buttons and other features are a big help and with grip you're camera looks PRO too lol! The only problem for me is that with my bags I can't insert my gripped a77, I'm looking for Think Thank Retrospective 20.

Sony A77 + Grip, Sony 16-50 2.8 SSM, Sony 50 1.4, Sigma 70-200 2.8 EX OS HSM, Sigma 105 2.8M EX OS HSM