What do people think of re-using quick-links? I need to swap my chain shortly, do I need to get another quick link or can I take the one in my current chain across?
With a new chain, it's best to get a new quick link. The old quick link will have worn and stretched with the rest of your chain, so if you were to fit an old quick link with a new chain, the quick link would be more worn than the rest of the chain.
Quite a few quality chains will come with quick links anyway. You could always put the old link in your saddle bag as a spare just in case of chain failure. Unlikely to happen, but you'll be thankful of having spare links if it does!