I've been using the Gatco unit for years with good results. I just started using the Worksharp basic unit and it works very well. I feel Gatco is a step up from Lansky, and Worksharp is another step up from Gatco.
I just worked over a handful of knives with the Worksharp and quickly got to a shaving edge on them.
Hmm.. this is a good reference. Maybe I shouldn't have returned it, but they have the 15% sale on occasionally.