Whilst I like the HW45 I think it is pricey new,much better to buy second hand and let someone else take the burn on it.
The HW40 is a nasty little pistol,plasticky and feels cheap even though it isn't very.
I had one and the trigger was dreadful,the sprung first stage kept going slack all the time no matter what I did even threadlocking the adjustment screw in place.
The rear sight kept coming loose as well,glad to be shot of it in the end.