I use the HUD from the start of the take-off roll until about 20,000ft. I then fold it away but sometimes bring it down again in the cruise approaching weather. Most of the time it is away until about FL150 on descent then I bring it out again regardless of IMC/night/ day etc.
I find it good for finessing but use the PFD for 'gross' changes. I do about one landing a month without it normally due to turbulence ( personally I don't like it when it's rough). That's just me though, everyone I speak to uses it in a different way , it's just another tool to be used. Personally I'd be surprised if the HUD had any impact on the outcome of this flight and personally I'm on the PFD for the GA until levelling out.
All of the above is to show that different pilots use it in different ways.