You'll definitely hear from both sides of the fence on this topic! Some people love these needles and others hate them. There's just no accounting for preference!
Personally, I have a mixed bag of needles--Boye interchangeable needles (great for "sticky" yarns), Clover Takumi bamboo circulars and DPNs, Cubics circulars, Knitter's Pride Dreamz DPNs, and a hodge-podge of straight needles that people have given me.
Glad to hear you're learning to love your Denise needles. I hope they serve you well.