Speaking of aftermarket more generally, not just p.e. but including resin, brass and soft metal parts as well, there is a place for this but it can be very much over-the-top. You see a lot of people on-line detailing with aftermarket parts that will never be seen. In many cases I cannot see the difference between a kit with p.e. and one built out of the box....
I will use aftermarket for the following:
Seatbelts, even when included in a kit they are usually pretty poor compared to the aftermarket options.
Decals/masks - increasingly I prefer to paint markings onto aircraft wherever possible using masks as it looks so much better. There are often much better scheme options via aftermarket sets. Canopy masks as well.
To strengthen undercarriage using metal part replacements.
Resin wheels sometimes to replace vinyl ones
To improve the appearance of a highly visible part where really needed, or to correct a shape
To convert a to a different mark of the subject
To provide 'store options' not available with the kit
Replace broken or lost parts where a/m is available.
What I will not purchase sets for are to add detail to interiors as it can rarely been seen. Neither will I buy these exterior sets as only too often you cannot really see any significant difference, if any at all, after the model has been painted.
With my next build, a Spitfire VIII I am using more aftermarket than I have ever used on a kit before. As this is my third Tammy Spit build I wanted to vary the build a little. Even so I have been selective:
- Seatbelts - I have two aftermarket options a fabric set purchased a while back plus a Eduard Steel set. I will try the fabric first.....
- Resin tyres - the vinyl kit ones are poor but also I wanted treaded tyres for a Far East aircraft
- Brass cannon - I just wanted to see what difference these would make, it was an impulse buy and I am not sure that they will be worth it.
- Resin 'pit door - This is highly visible and the kit part is a weakness here. I used one on my Mk IX
- Metal u/c legs - These were recommended as worthwhile in a magazine. I am not sure but got them nevertheless
- Resin seat, another magazine recommendation and this one looks worthwhile, we shall see.
- A/M decals for 'Pauline' a Mk VIII based in India. I decided to paint the roundels so I also purchased a set of masks which includes canopy masks.
All in all there is a place for aftermarket parts but it is best to be selective. Sometimes you can just be 'guilding the lily' without a visible reward at the end.