You probably don't need anyone to tell you this book is great literature. You more likely want to know if the Kindle edition is worth the purchase price, and it absolutely is.
This is the Moncrieff translation, which I also own in a large, two-volume clothbound set from 1934. Simply put, the Kindle edition is considerably more portable and convenient than owning In Search of Lost Time in a physical form.
But there is an opportunity cost for choosing this low-priced ebook:
¶ It appears this book was scanned and digitized using optical character recognition, but not proof-read (at least not very closely) by a human afterward. For most readers it shouldn't be a problem much of the time, but you'll occasionally read passages where one or more letters have been printed in place of similar-looking letters.
¶ If you like making note of your progress through a book, you'll find it difficult here. Some ebooks have section markers shown as dots in the progress bar at the bottom of the Kindle screen; there's none of that in this book. And because this contains all six books that comprise the story, trying to judge your progress by checking the percentage at the bottom is unhelpful because it takes maybe a full day of reading to advance just a single percentage point.
Despite its flaws, you can't really go wrong purchasing this edition of In Search of Lost Time.