Not a canon person, but I will be interested to hear reports on your experience with this lens, as it seems possible that Yongnuo will eventually come out with a Nikon version too. Both the Canon and Nikon "nifty fifties" have a good reputation, so it will be a hard job to outdo them, worth keeping an eye on.
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The lens gets good reviews, and the cost in UK is just under £40 compared to the Canon which is just under £100. It is said to be a copy of the Canon.
I purchased in the UK, from Hong Kong they are marginally cheaper, however there could well be import duties and VAT to pay. The buyer is responsible.