The reason most glass doesn’t render well in Eevee is that it can’t handle multiple layers of refraction. You’ll only see the front faces and any other refractive objects behind it will be invisible.

The CGC Eevee Glass shader doesn’t fix that fundamental issue, but it does cleverly disguise it by giving you more control over which parts of your object are refractive or simply transparent. The result is glass that is much more believable!