Had wanted one for years.
We spent a small fortune having one built 10 years ago. Looks lovely, we spent a lot having the proper blinds fitted etc.
Problems is, we never use it!
It's south facing, boiling hot in the summer and so bright you have to wear sunglasses. Come winter time it's so, so cold. We have a massive radiator in it but it costs a small fortune to heat.
Got a quote to add ceiling and changing the roof to a tiled one so we can make it into a garden/summer room but was quoted £8k 😢
So, basically it's a nice looking spare room, wish I'd spent the money on a new kitchen instead!