It is strong and hard, and holds hardware and glued in stuff really well.
Plus it is totally waterproof, so my days of sealing before I can test float lures are gone, and so are paint jobs ruined by water intrusion.
AZEK cuts and machines like wood. If you use dull tools, it is hard to cut, and a dull tablesaw blade will melt as it cuts, and you'll see wispy trailers.
But it machines and carves really well.
The dust has an electrostatic charge, and is very obnoxious, so wear a dust mask. It sticks to everything. I use an oscillating belt sander to shape my lures, and take the lure outside to blow the clinging dust off it and my hands before I continue, after each shaping session.
Maybe some cling free laundry spray would help with that, but I haven't tried it.
It holds screw eyes fine with just a small pilot hole. I run mine in and back out, coat with super glue, and run back in.
I also drill small holes and use the figure 8 sst sinker wires for line ties on my cranks, so I can turn them crossways and minimize hook rash. I drill a hole the same size as the 8, fill it with super glue, set the 8 in and position it, and then hit it with the accelerant. I've never had one pull out.
I do the same thing with smaller Spro swivels, and they work great for belly hangers. I drill a snug hole, test fit the swivel, and then remove it, coat the inside of the hole with gel crazy glue, and reinstall my swivel. The gel give me a little more working time. The biggest fish I've caught on a swiveled popper is 8+, so I know they hold.
AZEK trimboard doesn't have the tensile strength of their decking, but it is more buoyant, almost like balsa. For the baits we make, me anyway, it works just fine, and allows me to place my ballast in the belly without affecting the action of the lure.
I hope this helps.