Usuhari Glass Sake assortment by MatsuIsao glass

Update - after regular use for half a year, the set has already outlasted all of my others. My initial fears were unfounded. The glass is still thin but it's clearly strong and it's very pleasant to enjoy a nice sake with this set.When I first unpacked this set, I was a little disappointed. It looks nice enough but the glass is *very* thin. Really really thin. I have a cabinet full of odds and ends from different sake sets as pieces invariably get broken and these look to be the most delicate of any I've ever purchased. That said, once filled with sake, they are really very nice. The bottle pours beautifully with no drip and the cup is nice to drink from. I do like using them a lot but my only question is how long will they last?