I think its an outstanding tool if you like to consider a wide range of data - to me its better than a shelf full of Reloading books (but no substitute, all Quickload load information needs to be carefully verified from an independent source IMO).
It has a few frustrating limitations in that it doesn't cover all powders and some projectiles, so some new ones like CFE BLK are not there.
If you are prepared to understand and measure all the external variables it will give you very accurate velocity predictions (most of mine are within 10 fps or so once I have the rifle "set up"). From that you can assume that its pressure data is pretty accurate too (and man some poeple run hot loads, many make me cringe a little ).
I got it (twice now over 20 years, lost the first copy) from the US supplier, he is excellent (but very occasionally slow to respond, I think he goes away shooting or hunting or the like).
Cheers
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