DavecUK Also turns out they get hotter on the top of the machine. My ceramic ones feel very warm, glad ones feel hot.
dutchy101 I'd say 80ml is plenty, you just need to be careful stirring if you go for a 1:3 shot. 250ml will obviously work for espresso and I can't think of a downside really (other than storage space) - it would also mean you could try a long black/ Americano.