be aware the IR version will be quite annoying. You won't have continuous shooting. You won't have the half shutter press. Plus the IR switches off after a set time (up to 5 mins iirc)
plus afaik the IR version is only available from the chinese manufacturers. I don't think Hahnel make a IR version.
I thought about getting one but decided to plump for the cheap "copy".
Another issue with these grips is the placement of the tripod mount. They don't tend to align with the original which can mean your central point is affected - kinda relevant if your doing pano's.
Because they are not exactly solidly mounted they tend to add a fair bit of wobble when on the tripod. I guess that's swings and roundabout tho depending on the make.
Have to say tho, I've got big hands and it feels GREAT handheld
