To glass or not to glass is often a question we ask ourselves. I suppose one really needs to ask what exactly are they trying to get out of the rocket?
Let me start by saying that most rockets simply do not need glass. Folks do it because they think they have to when in reality, they do not.
That being said, the answer really depends on what you, the builder, want out of your bird. If you want something a little stronger that can survive a rougher deployment and a rougher landing so you can hopefully keep it for years and years, but are willing to sacrifice a bit of performance, then glassing is a good idea.
However, if you want the lightest possible highest performance bird and are willing to take your chances on deployments and laudings, then you likely won't need glass. On the flipside, if it is some mega high performance vehicle you are building, then glass will likely be one of the multiple composites you use to build the rocket.
So, it mostly depends on what you want out of your bird.