I built the one at ElliiottSound Products a while back. I actually did the 78rpm version. It's inexpensive, and quite easy to build.
It works well, very well for my use, but I don't like its sound as well as that of the phono section in my preamp (NAD c162). I was never able to get it as quiet as I wanted. It has a slight hum that disappears in mono -- which is great for 78s, but I wouldn't be satisfied for stereo recordings.