Mercury Fancy Leather Intuition Optimus

I purchased this totally blind and so far am very satisfied with it's performance. This is a new phone, so I don't have much to compare it to. I have not used the NFC to confirm that it works. I will update the review if something needs to be changed. That said,
I purchased this expressly for using my phone as a gps tracking device for day hiking, knowing I'd be out 8-10 hours at a time and may not be in cell tower range. I'm assuming that the phone is constantly polling and even though I had all notifications off, I also assume this is not a very battery efficient setup. During my week away, at the end of the day, I would get back with 35-50% battery left. I used the phone heavily in the evening on wifi and still had plenty of juice left before I recharged for the evening.
For my purposes and at this cost, this is a winner. I have no way of knowing if it has as much "oomph" as the higher priced offerings, but it certainly is a nice alternative.
It is not as bulky as I thought it would be. I certainly didn't get the urge to rip it off as as soon as I returned to "civilization". The new back is serviceable. I'm not a fan of these zipper backs, but that is Samsung's issue.
If the battery came bundled with a charger it would be outstanding.
UPDATE: I have been using this battery for several weeks. I have tried to run it down, I get at about 1 day and 14 hours with 12% left. That includes two hours of streaming podcasts or radio, an hour of workout, email and phone. Some game playing, Temple Run for about 20 minutes as part of the test. I am very pleased with this battery. The one con is the battery back is hard to get off.
Phone:
Google Galaxy Nexus (i9250). I purchased battery and the Trexcell TPU flexible case for extended battery (fits great) and I use this case, as well as a body glove and Cruzer Lite with a Seidio Surface holster. Basically got the holster and two of the three cases for the cost of the Seidio Surface combo together, but I guess that is another review.
I usually end up complaining in reviews. It nice to be able to recommend a good value. Don't let the lack of reviews and the low cost put you off.
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Mercury Fancy Leather Intuition Optimus Now!