Al,
I use the (even cheaper) "Standard" version of this unit, not the "Super", I've found the unit to be very usable indeed. I had to have it re-chipped to work with my Pentax K10D when I swapped cameras, this was done by Sigma for only the cost of return postage (£7.99 IIRC), turnaround for doing this was about 5 days from me putting it in the post to me getting it back on the doormat. So, I'd have no worries about compatibility.
Build quality isn't 'pro-spec', but it's perfectly good enough for the light amateur usage I give it. I use it mainly for still-life subjects, and have not explored the multiple flash firings issue that Don has found. I dare say that if you are going to be using the flash for bursts of >8 in a row, you should be looking at something a bit more expensive.
I haven't had any problems with my manual, though the standard unit is a lot simpler and I tend to only use full program or full power manual modes anyway.
The flash itself has LOTS of power, you won't be wishing it had more ooomph. This is good because there's plenty of light even if you have to bounce it off distant walls and ceilings.
At the time I bought it, the standard unit was £100 and the Super was £200, I couldn't justify the extra at the time as I wasn't really into flash stuff then. Thanks to WPF, I do more flash photography than I ever used to and now wish that I'd bought the Super model, especially as the price difference is now so small. Bristol Cameras have the Super for £135 plus £10 P&P.
If you aren't going to hammer it like a pro, get the Sigma, if you are going to work as a hack for the local rag, get the Nikon.
Hope this helps.
Duncan
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