Haven't tried that particular one, but my experience with third party batteries is that they are a blatant rip-off. I bought two BH6X replacement batteries and the things came labeled "1880 mAh" - except they weren't. They were only 500 mAh and they reported this value to the phone. After multiple conditioning cycles (100% - 10% -100%) they don't give me more than three hours of use. Ditto for a gigantic 3200 mAh battery I tried. It was seen by the DX2 as 1880 mAh (in other words, a BH6X) and didn't even last as long as a real BH6X after six conditioning cycles -- dead in 6 to 7 hours.
Don't waste your money. Stick to the genuine article.
Gross generalization! I have both a 3500ma battery from Gorilla Gadgets and an extended battery I bought on ebay for $4. Both of these markedly extend the time available. I have had the former go over 70 hours before I got tired and just plugged it in. The latter is slightly thicker than the stock battery. Currently I have been unplugged 29 hours and my meter still shows "60" % left. Granted I minimize battery use by every known technique but all in all both batteries lasted significantly longer. Maybe I'm just lucky but I think it was worth the shot for four bucks. Word to wise - get the extended door. Sure you can shoehorn it in the case but you are causing undue pressure and maximizing heat accumulation. I found a real cheap door on Amazon which was OEM ($5.50 incl shipping) Bottom line, you can play it safe, and expensive and enrich VZW or take a chance and soar like an eagle, for a lot less (sometimes).