Has anyone had aluminium gable barge boards, fascias and soffits installed?

We have marine plywood 18mm substrate.

 We are installing the aluminium Kytun Dry Verge on a natural slate roof.  The plan is to install the Kytun Dry Verge and slate the roof first then use and use 3 or 4mm spacers on the Kytun Dry Verge to maintain a gap in order to push up the aluminium facias underneath the verge. 

It would be enormously helpful to hear from others who have had aluminium installed.

We are looking at Kytun AluSwift and Guttercrest.

We are aiming for longevity and hopefully zero maintenance. 

We are looking at Lindab Magestic for the gutters.

Many thanks

I'm doing this right now - doing it myself not getting it installed. I suspect I'm no use to you anyway as no experience of how it will perform over time. Like you my hope is virtually zero maintenance for the foreseeable future. Slight difference in that I don't have a ply substrate. I attached short treated vertical hangers to the ends of the Trusses/rafters and screwed the fascias to them. (Ply would have been easier if the ends of the trusses/rafters were uniform and vertical but sadly they were anything but!!) I'm using some of the wood that we're cladding part of the house with for the soffits. Did consider aluminium for that too but preferred the aesthetic of the wood mix in our context.

I used Kytun Dry Verge aluminium with Spanish slate on the roof (professional roofer used - I just laboured!). The product looks good to my eye, but is very easily damaged and about 1/3 of the lengths bought were damaged when I unboxed them and had to be replaced. I've since heard of a specialist roofing supplier who will no longer supply Kytun as that was too often their experience.

As you say the Kytun was positioned with a ~5mm stand off so that I could later push the Fascia up behind. I used Alutec Evoke Fascia. Gutters are ARP Aluminium deep flow.

Fascias all done but only able to fit the gutter brackets as the scaffold uprights are too close to fit the gutter itself. I've had enough of paying for changes to the scaff for every task that crops up so I'll wait 'til it can go and clip the actual gutters in off a ladder!