I've been using and specifying Bedec paint (MSP and Barn Paint) for about 10 years now, I reckon. I have specified it for everything from exterior joinery* (windows, doors, conservatories, pentice boards etc), soffits and fascias, to kitchens, second fix joinery inside, including stairs, and for an architect it is one of those safe products which you know you won't have any come-back with. I have also used gallons of both MSP and Barn paint myself, including for all my outbuildings and for the entirety of my own home-made kitchen including the internal (solid wood) shelves, and it is universally superb. It's pricey, has a poor range of colours, and can take a coat or two more than other paints to achieve the finish you want, but it is robust. I can honestly say that I have never had a single failure, either in my own experience, or in the many jobs where I have specified it for other people. As a minor bonus, it is water based and all-but odourless (I'm told, I have anosmia) so applying it is a far more pleasant experience than using an oil based undercoat and gloss.
*It is from the same basic category of paints as the factory applied micro-porous flexible water based paints which are sprayed onto higher class windows and doors, and which tend to last at least 15 years before they need touching up.
I have no connection with Bedec. I wish I had, as the buggers charge me full whack for the stuff!
I shall be using it on an up-coming wooden greenhouse in the spring (and there is an issue.........it isn't suitable for application outdoors in the winter as it can't be used below a certain temperature).