I installed a similar one on my 98 T/A. It is black so I painted it to match the grey interior. It was easy to fasten atop the dash with the supplied glue. I think it looks nearly perfect with very slight misalignment at the right and left ends. Note that this one has a little different shape than your car's.
p.s. I just haven't gotten around to putting some glue under the right end yet.
The cover came with a tube of silicon adhesive/sealant. You place some adhesive in several places according to the instructions and push the cover down. I just applied it near the rear-most edges so I could use a putty knife to remove it if necessary (not easy, but possible). I actually did remove it later when the paint didn't look good enough from outside (uneven/not enough paint).
The actual installation was very easy, maybe 10 minutes. I left some small bricks on top over night to make sure it was set.
The hard part was painting the cover first and getting it to match. I had to try two Firebird grey interior paint colors and had to apply several coats to get it even. I used the exact process for paint prep in the instruction sheet and paint sheet..
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