Factory vs custom built wheels

dixonpj
dixonpj Posts: 75
edited February 2008 in MTB buying advice
Merlin are doing Shimano XTR wheelsets for £399 with a further 5 per cent knocked off at the check out, and I'm sorely tempted, even though this is still £50ish more than their most expensive custom set (DT 4.2ds on DT 240s come in at around £330 IIRC).

What are the pros and cons of factory and custom built wheels? Why are factory built sets more expensive? Crucially, how difficult would it be to get hold of a replacement XTR rim in the (admittedly unlikely) event I wrote one off?

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