I had one last month in the horror category. It was a failure, as I only sold 178 books at .99 and the FNR cost $260 in my category. And - unlike the Featured Deal - the FNR has NO tail at all. On day 2 sold 44 copies and day 3 was a meager 11. By day 4 it was 2 sales. Not great. $260 for less than $70 in sales.
The following week I ran a Bargain Booksy, ENT, Book Scream, Book Raid and FKBT and sold 350 copies. The total of all those cost me under $90 and made profit.
Week after, at a higher price of 2.99 I ran a Fussy Librarian and Book Rebel and sold 54 copies. Much better.
Fourth week I raised the price to 7.99 and ran FB ads and have been selling 8 to 19 per day (35 on one day spike for some reason).
Yeah, all in all, I could have done better using that $260 on FB ads. However, the problem might have been the price. A Featured New Release does not list the price in the newsletter, so many people assume it's 9.99 to 14.99 like many other FNRs, so they give it little attention. If you do a FNR, I suggest making it full price. Another quirk: BB writes your blurb and mine was a little "off" in that it didn't come close to describing the book (made it sound like something else).
Note: With the 1 regular BB I had, it was a great success and had a long tail. The FNR was a dud for me. Not sure how others have fared. From now on I'll only apply for the regular deal. If I ever try a FNR again, I'd made it 7.99 or higher.