Cheap rechargeables batteries any good?

[Nazgul]

I bought myself 4 Duracell AAA 1000mAh rechargeable batteries today.
But searching across eBay I came upon some 1800mAh or there around rechargeable AAA no-name batteries for REALLY CHEAP. Do you think these are any good and will last longer when fully charged compared to Duracells?
Interesting thing is that all brand-name commercial rechargeable AAA batteries end at 1000mAh, but there are no-name rechargeable batteries with higher capacities.

I'm using these batteries for my Korg PX4D unit.


Any thoughts?

Thanks.