My promos are ongoing. I haven't been able to beat my Paid in Kindle Store rank from February's promos, but I've changed categories to ones better suited to my books, and since they were smaller categories, I have made new lows there.
So far, my best results were from Robin Reads, so I can confirm what others say--this is one of the top promo sites.
My goal with this promo was to discount book one to drive traffic to book two, which I launched at $3.99. This strategy has been moderately successful based on my small expectations. If someone is hoping to achieve a low sales rank and get promoted by Amazon as a hot new release, this isn't the route to go. (Unless you already have a big following). It's accomplishing what I set out to do, though, so I can't complain. I'm getting a trickle of sales for Shadowglade as well as some KU borrows and KENP. I'm hoping that many of the people who bought Beyond the Forest will read it and immediately buy or borrow Shadowglade. We'll see.
I've already started to book a couple promos for mid-June, when I can run a Kindle Countdown deal for Shadowglade. I booked a double promo (both books) with Book Barbarian, and also with Fussy Librarian.
Another note for those of you with new releases: People Reads has a New Release category, and as I recall, you don't need many reviews. (starting to get foggy on the various sites and requirements.) I booked Shadowglade at $3.99 with them for this Friday, and Beyond the Forest is running in the fantasy category on Saturday. The normal price for each promotion is $8.99, but they gave me a 15% multi-book discount, bringing the cost per promo to $7.64.
I also ran a KBoards discovery ad for Shadowglade ($15) and I'm not sure what my results were since I had another small promo yesterday plus AMS, but I may have gotten a sale or two and a couple KU borrows. I consider it a donation to the Kboards, which has been a wealth of information, and any sales or KU are gravy.