Last year everybody thought convexing was better than a wet dream. This year the 'fashion' seems to be flipping back to V-grinds. I prefer convex edges myself.
It seems the biggest complaint is that people don't know how to maintain them. Its easy, but also requires a different mindset that what folks accustomed to V-grinds normally do. It took a lot of practice before I was comfortable with convex, especially when it came to converting a v-grind to convex. Stropping motions at first seem weird when you are used to blade forward strokes during sharpening. I also find it more difficult to get the edge on a convex to perform at its peak, i.e. push cutting etc. I find it far easier to strop to a nice polish and then put a micro-bevel v on the very edge to achieve the hair popping sharpness I like. This safes me a lit of time compared to the complete stropping route.
My real preference is for a full flat grind with a convex edge as opposed to a true convex grind. On the necker that would be more weight savings which I think is more in keeping with the function.