Really Good so far!
Bought 2 of these a few months back after my Nokia battery was completely flat, and used to die within around 5 hours of being charged.
2-3 months down the line and the one i have been using has been holding up really well. I can now leave my mobile for days before it needs charging again, and i use it often every day, so im certainly getting my fair share of use from my phone.
Seems like a really good battery, for a brilliant price!!