Pretty good actually.
I'm very happy with how sales of Red Mercury are going. Whilst I'd obviously have been delighted if it had become a surprise bestseller, I was fairly realistic about the prospects of that happening! It's ticking along quietly but nicely, probably shifting an average of a copy a day now since the initial rush died off.
90% of my sales are still coming through Amazon, with about a quarter of those being actual print copies through Createspace. This was a real surprise to me. I assumed I would hardly sell any of the print version, and really only set it up so I could get one myself. Beyond the copies sold, I think the availability of the paperback also makes the e-book a more attractive proposition in price terms, and a couple of friends actually said to me that they only thought it was a "proper book" once it became available in print. So it probably does something for the book's credibility too.
I would heartily recommend any first-time writers set up their book for Createspace as well as for Kindle etc. It's relatively simple and whilst I love my e-reader, nothing beats the joy at having an actual physical copy of your own book in your grubby little paws!
I've been delighted with the reviews Red Mercury has received on Amazon in the UK. You can read them here, if you're interested - a whole bunch of 5-stars and a couple of 4-stars. The best bit about it all? Only two of the reviews are from mates, and even those were from folks who I have no doubt are blunt enough (no disrespect intended) to have told me if they thought the book was rubbish!
One small frustration is that UK reviews don't appear on Amazon in the US. A real shame, as the book is yet to really get much traction in the States. To date, only 5% of my sales are from outside the UK. I've got a couple of ideas to get a bit more attention over there - I might try leveraging some of my LEGO contacts! We'll see.