I've actually not used in them anger, just looked into them at one point, the only reason we didn't go with them was because we didn't want to tie ourselves ove

I've actually not used in them anger, just looked into them at one point, the only reason we didn't go with them was because we didn't want to tie ourselves overly to SQL server. I'm assuming it can only work sensibly if you have an ID-generation/usage mechanism that means an ID should never be re-used even after records are deleted, which is arguably the most common scenario anyway, but I have worked with at least a few database tables in the past where this wasn't actually the case (IDs were randomly generated but with a sufficiently small range of possible values that there was a reasonable chance of generating the same ID twice within, say, 6 months of heavy usage).