I have no first hand experience, when I went SS i was building a new bike with a flipFlop hub, but...
The surly one seems best to me http://www.surlybikes.com/new/spacerkit_pop.html as it comes with most varying size spacers to get your chain line right.
The dmr seems to follow this idea to some extent too http://www.simplythebike.co.uk/product_info.php?products_id=192
The on one and others have the two spacers only of slightly different sizes giving only 2 chain line options. Perhaps that is enough and the surly is overkill.
@_imMe started
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I have no first hand experience, when I went SS i was building a new bike with a flipFlop hub, but...
The surly one seems best to me http://www.surlybikes.com/new/spacerkit_pop.html as it comes with most varying size spacers to get your chain line right.
The dmr seems to follow this idea to some extent too http://www.simplythebike.co.uk/product_info.php?products_id=192
The on one and others have the two spacers only of slightly different sizes giving only 2 chain line options. Perhaps that is enough and the surly is overkill.