I have stones, the 1x30 harbor freight belt sander with lee valley belts and the KE worksharp (along with a spyderco sharpener, dmt stones, and way too many strops and other gear).
For re-profiling or getting a dull edge back quick I really like the Work Sharp KE and it does the job well with the guides, quick and fast. I must mention that you can ruin a tip on a knife quickly with this or the belt sander if you dont watch what you are doing. I generally do larger knives and machete's on the 1X30 as its just easier for me, I also prefer to do Khukri's on the 1X30 as its just a little weird doing it with the worksharp. I used to do all my convex edges with sandpaper up to 4000 grit or use stones. I just have gotten lazy and really dont need a mirror edge on 99% of my knives so I simply dont do them unless I have one already established.
One gripe and really my only gripe about the worksharp is that if you are placing it on a hard surface it tends to dance, I wish it had sticky cups on the bottom of the handle and the belt assembly. So I have gotten into a habit of clamping it down or doing it on carpet where shifting is less significant and with larger blades two hands might be use-full.