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Ha! I have read that review already today, didn't make the link to your username. I enjoyed it, good work.
2 things I'm struggling to find out are the number of gears and a geo chart. From what I can find about them the top tube ctc tends to be 25mm longer than the seat tube but can't actually find sizing for a 50cm.
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The Alfine SG501 it has is an 8 speed. I have one - it's great but as @Sparky said, make sure you keep an eye on the shifter adjustment and remember to back off the pressure as you shift.
I love it. That sale price is half of what mine would've been new. There are no components where they've skimped excessively. Alfine hub is great (just make sure to adjust it (super simple process) a couple of times as the cable stretches or it jumps out of gear ALL the time). Paint job is tasteful. Do it.
My review is still around if you can be bothered to read my waffle: http://www.telegraph.co.uk/men/active/recreational-cycling/11744366/Genesis-Smithfield-review-a-commuters-friend.html