How does everyone feel about can glasses?

Got one free at a tasting, never use it. Would never buy one. I always use a tulip glass

 

Most people on this thread who have tried them, liked them, however it seems there is a wide variety of quality of the can glass out there, and at least two sizes. Mine are fairly heavy at the bottom and thin out but still strong near the fluted lip. They are 16oz. They have a swirl inside on the bottom, but are not etched. They are far superior to a "shaker" pint glass, imho, and I'm not getting rid of my other snifters, tulips, 22 oz nonic etc - but I am cleaning house on the number of the old shaker pint ones which were never meant for draft beer in the first place.