For nostagic reasons they are cool, but were not well recieved. The CSS line had the popular 19 but the 28 and 33 that you have pictured just could not compete.
They were extremely heavy for thier size and powered by twin 454/330hp engines that would only move the 33 to about 45-50 mph.
There were no amenities such as flushing head or a/c that the true performance boat market had to offer, including a low cuddy style ceiling.
With the competition powering thier boats in the upper 70 mph range. Glastron flat out could not compete against Baja, Fountain etc and thats why it was short lived.
It did have the familiar lines of the Crownline 266 LTD, and to date the LTD is still great looking.