For the money they are ok. Look after them, balance them, store them correctly and they will do ok. But like most things the more you pay the better.
I run two sets of those but 5000mah and they do me fine, not crashing so much is far more important on lap times where I'm concerned! If you want to use them for bashing around then obviously the more mah rating the better.
Check with your local club if thy are allowed at your club if you intend racing with them.
I have nano techs now but still use my normal Turnigy batteries. I only notice a little less punch due to the lower c rating.
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