In regards to the timber tek Firewire, thought mine was a bucket of snot.
Collin Earle did a heap of repairs for me, under the fins it had worn through the resin and also damaged the wood a bit, no glass there.
Seems to be no glass on top of the wood at all, just that resin that is thin and brittle, it cracks very easily, on the nose it also just wore off completely from being put in and out of the board bag.
Had to check it and touch it up every session with sola res to avoid water damage to the wood(ugly discolouration and eventual rot that you have to dig out)
The board itself seemed structually solid and didnt ding at all, but the constant cracks and exposure of the wood