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:

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