You might want to take a look at the link in my signature. There are some videos in the listing you might find generally useful, and a description of the sharpening widget I make. Its a full service tool. Have been getting nothing but positive feedback since I started selling these - there are a handful of quotes and direct responses on the thread as well. It promotes good freehand form, so makes a good tool to use as an introduction to other types of freehand gear (Waterstones, India stones, etc) should you be so inclined. Still have a few on hand and will be making more.
Otherwise, the Sharpmaker gets good reviews as a touch-up tool, and many of the mid range aligner systems seem to have a following as well - DMT, Lansky, Gatco all make reasonably priced units. The cost of the more involved guided systems will climb quickly, as will some of the powered systems.