Usage
Pro - More battery capacity.
Con - Bulky
After- Market
Pro - Cheaper
Con - (small) cheap construction.
The construction is relative to how well it is used. I have an after-market version pick-up for about $20.00 on Ebay and have been using it for over a year now and it still functions. The clock battery though is a bit suspect but i do not use that. I remove and insert the batteries often and insert a power supply battery eliminator to give me extended time for AP. I know the limitation but treating the unit correctly it has lasted a very long time indeed.
I also considered the option of buying a single genuine grip to how many after-market grips and also worked out the benefit of having to buy 4 or more units for the same cost as a single genuine. After-market won hands down.
If you need to use of the clock and other LCD operations on the grip then the genuine may work in your favour, I can't really comment on this.
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