I just finished Breakfast at Tiffany's and I thought it was pretty good.
Will I enjoy the rest of Capote's work if I liked B.A.T?
The operative word being "most," I'd say yes. I love some of his short stories, and as I recall he wrote a memoir of his childhood that's really delightful.
The one BIG exception to the above is IN COLD BLOOD, which is his category defining true-crime story. Expertly written, but a whole 'nother kettle of fish from BREAKFAST AT TIFFANY'S et al.
Also I enjoyed one of his first books, Other Voices, Other Rooms. I'd recommend that.
I've not read In Cold Blood, but it's considered THE non-fiction book of the 1960s. It changed the way non-fiction could be written. I also liked The Grass Harp, and recommend that.
My signature is a quote from Truman Capote.