Here's my experience. They're all for honest reviews and aren't shady:
My newsletter: I get a couple. Usually when they contact me, they review but they're a few. My list is around 500 and I continue to grow my list.
Booksprout: I get a handful. I recommend.
StoryOrigin: I haven't had much luck with StoryOrigin. I find that, though people talk about reviews here, it seems primarily for sales or newsletter growth. Perhaps others can chime in here. I use them successfully for book fairs and newsletter growth.
Library Thing: I'm actually running a current giveaway for my upcoming book there. I usually get a couple.
Shifted Sheets on Fiverr ($50): I got around 3-4 when I used them last time. They run a similar giveaway system to LibraryThings but they aren't free.
Netgalley: Hmm. Netalley seems academic and can be brutal, so tread carefully (though to be fair I've got a couple really nice ones there). If you're wide, Kobo runs a really good discounted service for Netgalley.
Hidden Gems: Top notch. This is where it's at, but you have to plan a year in advance (which is crazy for prolific Indies like me). They know they're good and, apparently, so does everybody else.