I did some research and didn’t find anything too negative towards getting this Phottix BP-40D vs a Canon BG-E2/BG-E2N as a grip for my 30D other than the make. The pro-point is that its only $75 shipped from Hong Kong to San Francisco. It has the same features as its Canon counterpart but for less. Here are some points from the eBay seller, etefore (aka. HK Supplies), of whom I got it from: