Just finished testing of MNKE IMR 26650 4000mAh batteries sold here in the marketplace.
They are advertised as "IMR LiMN" so some may think that they are high-current capable. Unfortunately they doesn't seem to be really high-current li-ion cells. Based on the performance I would say that they are just common LiCoO cells.
edit: Please note, that batteries sold by gigainternational.com are probably fake MNKE cells and not the real ones...
Comparison with top 18650 li-ion batteries and unprotected Xtar D li-ion.