I published with iUniverse in 2012, and had a decent experience, given that I was totally inexperienced in publishing. They did keep hounding me for promo events, but that stopped when I asked them to.
I do still get small royalty checks and recently ordered copies of my book, with the publisher's discount.
The quality was good, though I needed to have proofed it better before submitting, since I ended up having to pay extra for some much need corrections to typos. Overall, a positive experience (especially once they stopped bugging me to market the book)
Product or Service Mentioned: Iuniverse Publishing Service.
Reason of review: Good quality.