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I’ll give Allcoat a try next time I do our doors. I think I heard about Superdec on PaintersPitstop, quite a few recommendations on there (and some detractors). Bedec Barn Paint was mentioned as a potentially better but similar alternative, but I’ve never tried that.
Sharkstar-
In the last few years I've used Farrow&Ball, Little Green and an odd one called Porslin from Eico. At customers request. They are all much the same but I've learnt to be very thorough with the undercoat, then allow as many thin top coats as you think it needs so you're not trying to load the paint on. Also, never try to go back and touch up a panel while you're painting if the paint is acrylic. Last one I did I used scaffolding to set up a cover from dust and sun and that helped a lot. Thinking about it I'm starting to roll eggshell a lot more these days and that might make the process a lot easier.
I used to dream about the No. 10 perfect gloss black door but then it occurred to me that there are probably at least 2 and they get sprayed and polished at huge expense in a dust free factory somewhere and switched over when they need it.
Airhead
I probably would have used it more but the supplier I generally use before online ordering became a thing didn't carry it and if he ordered it in for me it was expensive. It is odd how some decorators swear by it and others don't like it at all.
There's a forum called Painters Pit Stop where paint systems get a lot of thorough discussion based on real world use. Benjamin Moore and Tikkurila were quite popular on there last time I was looking.
Allcoat has been working for me because the drying times mean I can get a few coats on exterior work in one visit to the site. It's less important if you're painting at home or painting a whole exterior but when it's one window and a site visit is a round trip in London traffic it makes a big difference. Plus the durability is fine, at least it is in the white gloss. It always looks a bit thin until it fully cures.