I had my vampire craze when I was like 15, 7 years ago...that was with the Vampire Chronicles and such... But with Twilight, it's not even really a VAMPIRE series for me, it's a romance, it's a love story, and the vampire part is just a cool twist to it all. So I'm not attracted to these other vampire books because they're making the craze into a VAMPIRE craze, which is not what I'm experiencing lol... Same reason I don't care to check out the other vampire shows and movies flooding the market now. I love all the Twilight characters, and the plot line... that won't be in the other books so I'm not feeling any drive to read them, that's all. I'm sure there are plenty of good reads out there.
Ps. I read one book back when I was younger called Silver Kiss, recently saw it placed with the Twilight series and remembered it, don't remember the story much though, but it was a good lil read :)
I actually started the House of Night Novel Series and I think they're pretty good! Definetly not as good as Twilight saga of course! Buttt...definetly worth reading if you've read Twilight more times than u can count! So I also read Evermore and Blue Moon by Alyson Noel. They're good also if you want to read.