I've tried this, and with my 5D3 and Einsteins, I'm lucky to get a usable 1/250th - and that's with banding at the bottom.
To be useful in bright outdoor situations, you'll have to stop your aperture way down and/or add neutral density filters, but you may still have motion blur issues.
There are some rechargeable battery powered strobes that support HSS (via pulsing flash, like a Speedlight) or hypersync (slow-duration, like Tech Support said). I have a latter type unit and can sync to 1/8000th, though with a bit of banding along the bottom. It would be better as a wedding/event photographer, because the battery won't be dangling from the stand - much more convenient. A couple of them even have TTL, which would be a useful option in some event situations.
I'm wishing PCB would come out with their own such unit.
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