Being a reference book, you don't just read it once then never read it again or read it years later like you do with a novel. With these types of reference books, you return to them when you need to look up a word, and you continually 'study' them.
I'm about half-way through, and this book is amazing - you'd be amazed how many Greek, Russian, and Hebrew dictionaries DON'T have transliteration. I was initially surprised how thin it is - until I realised it's A4 sized, not A5, and fits quite a few words on each page. It was also quite affordable - in Australia, I paid just over $15 for it, but I would have gladly paid $30 or even $45 due to how useful it's been.
Can't recommend this dictionary enough!