Well as stated in earlier threads I got a Portrait grip for my E-510 for Christmas. Now have used it for a week I decided to write up a review for those of you thinking about getting this additional tool for your kit.
First off I have to say that now that it is attached to my camera it will not be taken off lol.
The speed with which the AF works now is stunning. And the ability to be out all day and shoot 3 full 2G cards and still have battery left, even at -5C, is definitely not to be left unsaid.
Strapping the Sigma 50 - 500 on the camera no longer makes it look like a wee little camera with a big hunk of glass in front of it as it balances out the feel and weight of the camera quite nicely.
It also addressed an issue that has been bugging me with just about every camera I have ever owned. That would be the placement of the camera shoulder strap hooks on the body. So many times I have turned the camera to switch form landscape to portrait and ended up with the strap hanging across the view finder and in the amount of time it takes to remove the strap the subject has flown/run off on me. The OwnUser battery grip also has strap loops located on the bottom of it which changes the entire handling of the camera for the better.
The bad thing about the design of this portrait grip is the physical size of it. For those of you with smaller hands it would be a little bit cumbersome to handle due to the diameter of the handle itself. Designed for the larger handed among us I find it quite comfortable but I am sure those of us with smaller hands would not.
The design takes advantage of the USB port in the back of th camera to give you full shutter/AF control with the new trigger buttons on either side of the grip.
The OwnUser grip for the E500 has a built in wireless remote trigger which, according to the documentation, no longer allows for AF to be used. However form using my E500 with the remote I have noticed that if it is set to AF it will still auto focus when you depress the wireless remote button half way just like the shutter trigger does. But I have not used the Portrait grip on the E500 nor do I plan on purchasing one for it as it has been downgraded to my backup camera.
OwnUser also makes a grip for the E410 and I can only hope that with the 410 being designed for smaller handed shooters that they took this into consideration when building the grip for that model.