I agree that it works as a four berth BUT would say will be no good as a long term prospect with growing children. As always bunks are only any good while the children are not too big. It's not all about a bunk length or width, it's about being able to sit up and read and especially with a top bunk getting in and out. Once the teenage years or size hits they all need their own single bunk.
Not sure how the layout works in practice as I would have thought older bigger children would want the fixed bunks but the younger ones would need to be in bed first. Might cause a problem at bedtime.
I see the alternatives shown are still the three Adrias that have turned up in all the reviews even though they are not appropriate.