Booking Through Kiwi

[KARL]

The system KIWI use is that, even though in addition to their internal booking reference they also quote an airline booking reference, you cannot with that reference access/manage your booking or check in online at the airline's site but instead you have to in effect check-in with KIWI - they send you what they say is a valid boarding pass. This seems rather odd to me and leaves me a little uncomfortable. Has anyone on AB first hand experience of this, does this work as it should (i.e. is their boarding pass accepted at the departure gate by the airline) ?

[Buenchico]

Kiwitravel.co.uk?

Kiwi.com?

Someone else? (There are loads of travel sites with 'kiwi' in their names, obviously with most of them having something to do with New Zealand).

If it's Kiwi.com, their Trust Pilot reviews are very good:
https://uk.trustpilot.com/review/kiwi.com