Love this set of double walled cups. Microwave a bit of cream and dispense your espresso directly into them. They fit perfectly with the Nespresso Piccolo where other cups are too tall or too wide. Note: with cream they hold just shy of the lungo (so stop the pour a tad early). Because of their petite size they can't stay scalding hot for too long (pre heat cup and prime your machine by running hot water into them first) but you'll be finished with the shot before you notice any temp drop. Slight variation in shape of inner wall makes for a nice presentation, these are hand blown. No cups had defects and arrived without breakage. I plan to use the tray to serve green tea to guests. Highly recommend this adorable, modern and functional set!
Addenda May 2012: third cup broke today. Filled with hot coffee while sitting undisturbed on the countertop, the inner bottom "popped" off and broke off into the outer shell. This "thermal" cup didn't like the hot liquid. Very sad state! I am downgrading my review accordingly. Lost about one cup per month to breakage and I haven't broken any other cups for years. Really feel disappointed because they are otherwise a good size and attractive. [insert sad emoticon here]. I wish I could get a refund!