Having done maybe 1,000-1,500km in all weathers the factory chain on my (6-speed) Brompton is starting to get a bit worn; my LBS measured it the other day and said it was probably past 0.5%. That doesn't seem like brilliant wear, but then the drivetrain catches a lot of crud and I don't baby it particularly - it gets a regular-ish wipe and a lube, with the occasional proper clean. The LBS's advice was either to change the chain soon, or to let it go to 0.75% then change both the chain and sprockets. Does this sound reasonable?
I'm minded to change the chain soon, as it's less faff than doing the sprockets as well. It looks like Brompton OEM chains are about a tenner, with cheap 8-speed KMC chains a couple of quid less and more expensive ones a couple of quid more. Are posher chains worth it? Otherwise I figure I'll just get the cheapest chains and change them a bit more often.
(As a PS, how often do people service the rear hub? I've never actually serviced an SA before, so I'm instinctively in the 'if it's not broke' camp, but I suppose it would be a useful skill to learn...)