I just had to put in a plug for Kirkus Indie reviews. I got mine last week.
My work is nonfiction, and the reviewer actually went in and verified individual facts with the data I presented - even found one shortcoming! They even did a sort of competitive analysis with other similar sources of information, and gave me a general indication on the merchantability of my book. Value-for-dollar-wise, very few services I've ordered in any field of any type measure up to what I got from Kirkus.
No matter what, I wouldn't spend an hour or a dollar marketing any book (current or future) without buying their opinion again first.
Good on you, Kirkus.