I've used D2D many times.
As to precautions, not sure what you mean. If you mean security regarding the cc number used, just the usual stuff of making sure the 'puter is clean and secure is all you'll need.
One thing to remember, if you do have problems installing that stem from corrupted download, you need to delete the download files from your computer AND remove them from the downloader list.
That doesn't mean you have to repurchase the games, though. But if you simply click on the game files to download again as they're listed in the downloader, the corruptions is very likely to be repeated for some reason.
I had that problem when I bought M2 TW Kingdoms from D2D. Worked out in the end though.
Another nice thing, my D2D version of M2TW Kingdoms is installed over a disc copy of M2TW. No need to switch out discs when I play one or the other. No probs with mod installs either.
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