Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
Protection circuitry prevents over-discharge and over-charge. Length is pretty close to 65mm. Never actually measured but it fits in my X2000 torch. Some complain that protected 18650s don't fit in this torch.
Measured at 1.0A discharge, charged to 4.05V, capacity read off the charger was 1684 and 1724. So the rated capacity of 4000mAh (obviously overrated) was more than 2x that of the actual capacity. Not much of other cons i can think of other than the overrated capacity.
You could buy this if you need protected cells but personally i would recommend the trustfire 2400mAh in black/red. They're just ~$2 more and they give a true capacity of 2400mAh.
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