From my own research on this it would appear that the results of the postal reflash service vary, however it's probably fair to say that for most people 90% of the way there is probably true, myself included. It made a big difference to my bike, but it's still not quite there. Next for me is a 14T front sprocket, which again for some people was the final little ingredient. Others have goe even further.
I wouldn't imagine many people have tried the postal reflash AND a custom map on the same bike, and that's the key point to your question really. You pay your money, you take your choice.
There's a load of information about it on here, you just have to trawl through it.
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