Another, chiming in as a long-time Durrell lover. I have the advantage here, of being British: discovered and began reading his earlier books when I was aged maybe seven or eight (when said earlier books were still relatively recent); and went on from there.
Am largely on the same page as many posters here, re finding the quality of his earlier stuff somewhat superior to his output “later on”. Am a bit surprised to have seen no mention of * Three Singles to Adventure*, his account of his “collecting” trip to British Guiana (now Guyana) in I think 1951 – have always found this one a total delight. Likewise *The Drunken Forest * – though there’s something of a sad element to this book, in that Durrell was a caught in Paraguay by a political upheaval (I believe, that which brought the notorious Stroessner to power in 1954): he had to abandon nearly all the creatures he’d collected in Paraguay, and flee the country in a tiny plane, bringing along just a very few of his most precious captures.
Much enjoyed the earlier books about his family / their eccentricities / Corfu; later non-natural-history material by him, I was less keen on. I find his pure fiction on the whole, ponderously facetious and not particularly entertaining or funny. (Had heard of The Entrance, but haven’t yet read it – certainly seems like something “interestingly different” for this guy.)
I feel that there are a couple of elements of his early books, with a potential for landing him in trouble nowadays. With those set in Cameroon: although he clearly very much liked his African associates and employees, his portrayal of their unsophisticated attitudes and comical way with the English language might, I suspect, lead some modern “goodthinkers” to take a poor view of his perceived position on racial issues. A sensible “take” is, I feel, that Durrell’s writings here come obviously from a place of affection, not scorn / hate; and that his Cameroon trips took place nearly seventy years ago, in very different times from now.
I have read that though Durrell had for sure a talent for writing, and wrote most readably and entertainingly; he did not in the least enjoy the writing process: most of it was, for him, slow and difficult – often sheer torture. He plugged away at it, though – to make money for his conservation work, and because by writing, he was able to give pleasure to many people.