I'm enjoying them - a lot. I'm not ordinarily a lover of mysteries or murder who-done-its. I stumbled into it accidentally. My mom left Visions here in a trade for a paperback I had that she hadn't read yet. I liked it and decided to start the series at the beginning. The grit and the futuristic noir are big plusses for me. The characters are strong. I really like Peabody. On the downside, the endings are a bit cliche and predictable. Roark is completely unbelievable and the sex is overdone.
It's a romance ... the male heroes are unbelievable by definition, and the sex must be overdone!
(Though, I swear, those two go after it like it's going out of style ...!)
But don't you like Roarke a little better since reading Vengance? It humanized him a bit ... and, hey, Vengance is the first appearance of McNab, who's just a doll!
If you somehow get your hands on any of the "blue lady" covers of the first few (up through Holiday, as I recall), hang onto them ... they're worth two or three times cover price, I believe, over on eBay.
Don't miss the short stories, and the novella Remember When, written by Nora Roberts and J. D. Robb.
And, just so you know, the newest novel, Memory In Death, comes out in January. One of the best things about the series is the twice-a-year publication schedule!