6.5 amps at... what, 8.4 volts? 54 watts? What poppycock (okay, old word, but works well for international users using e-translators).
Claiming 2300 lumens on high... 16 watts and 1500 lumens on low... who are these people?! Don't they give lying classes in Chinese marketing schools? Lying tip to the Chinese: the best lie is closest to the truth.
[Update -- Ok Tas62, the stolen specs do make more sense for a 3 x 18650 SST-90 flashlight]
Did you notice: "deep mental reflector".
(I think I have one of those in my head.)
(...further reading of description) that's some pretty bad Chinglish. "Feel good ,non slip", "The attack of Stell material Front cover design".
That said...
Techjunkie on CPF is routinely driving XM-L's to 5 amps and beyond. And some of these on budget flashlights!
Perhaps the most surprising to me was his SacredFire NF-08 zoomie (originally 3 x AAA) project (firmly in the budget category):
http://www.candlepowerforums.com/vb/showthread.php?t=307271
He runs that at 4.2 amps regulated. Before that, he ran an SST-50 at 6 amps... but said that got "really hot". He doesn't give any indication of special heatsinking for it. He says at 4.2A, "heat is managed well enough to allow an extended run". I don't know why, but he never discusses sag, either voltage or heat sag. From what I've been reading, Technjunkie routinely runs XM-L's in pure direct drive mode, i.e. with no driver... and with LiMn... and cells bigger than 18650(!).
I've seen extended back-and-forth on CPF whether you actually gain significant brightness over 3A with an XM-L, and while I've seen proof there that it can depend on the LED itself, I've also seen proof that in many cases, you're not just creating excess heat. What becomes even clearer is that the XM-L appears to be very forgiving when it comes to high current and excess heat. I've seen a lot of chicken-little'ing about running P60 drop-ins over 1.5A too, particularly on DX forums... so far, I've seen no evidence to support their claims, they offer none, and I personally have 3 XM-L drop-ins which all go either to nearly 3A or beyond on high, and no problems. I'm reasonable and don't use High for very long, though I wish Medium were higher than .75A/3 watts; 5 watts would be nice, since high is around 10-12 watts. A low on about 1 watt would be nice, but the lows IIRC are only about .7amps or around .3 watts which is pretty low even for close-up work.
I've seen people declaring 2.5A the 'sweet spot' for XM-L's. While this may be true, it also appears possible to get a lot more out of it with proper current and batteries. Hence the success of the Manafont Ultrafire XM-L drop-ins which typically go 3A and higher on high (I suspect they're simply pure direct drive in that mode).
It doesn't appear to have been established at what current XM-L brightness levels off and actually starts reducing. The few actual tests I saw were quite conflicting (one not becoming significantly brighter over 3A, the other one was), so I guess "more to come".