So far, slightly better than the original battery. No cracked glass during installation.

I have had the new battery for a month and a half. I think it is performing somewhat better than the original battery. I guess most people are interested in the the difficulty of installing the battery. I was able to do it without cracking or breaking either the front glass or the back glass. I did cause some very slight cosmetic damage to the little metal piece on the back at the bottom. But, since I keep the phone in a protective case at all times, this is irrelevant unless I ever want to sell the phone. So, I think the key to not cracking either glass is that I used a heat gun (a hair dryer will do) to warm up the glue underneath, and I was also very patient and as gentle as possible.

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