We installed a new front door ~18 months ago as part of other renovations.

We were very tempted by the aluminium option, but it wasn't available in a colour we wanted. We ended up with Duramax. Very good insulation and pretty dimensionally stable; you install it like a normal timber door and paint it (with some limitations) like a normal timber door. It does expand and contract a bit in direct sunlight (you can hear it creaking). Planning on using the same option when we move around to the back door.

The aluminium options we were looking at required aluminium frames to make the multi point locking work, so installation was more difficult as well - I don't remember the exact costs since it was all rolled up into one big bill, but I'm reasonably sure the Duramax option (ready hung at factory) installed by a builder was quicker and cheaper than the aluminium equivalent.

We did have an issue with the weather seal but the supplier fixed that without quibbling. Little bit of a hassle but not too much in the grand scheme of things.