I have a Tormek T-7. Like every sharpening product/system you use there is a learning curve in getting good results. If the stock stone it freshly dressed it sharpens quickly enough, but if you are SHAPING a cutting edge making big changes to the cutting angle or bevel, it can be done much quicker on a bench grinder. They offer adaptors to use their jigs with your bench grinder for just that reason.
Tormek believes that once the tool is sharpened, you refresh your cutting edge by honing it on the leather honing wheel(s), saving the need to sharpen as often.
Because the sharpening is done on a curved wheel (like a grinder) you hollow grind your bevels. The advantages/disadvantages of hollow grinding your tools is another topic altogether. But the edge of a hollow ground tool can be quickly resharpened on a flat stone, keeping the angle consistent without the need of using a microbevel to speed up sharpening when flat grinding your tools.
Hollow grinding is not as useful for tools with thick bevels such as mortising chisels, because by the time you have a hollow ground bevel you have a fairly seriously hollowed out bevel.
The new Tormek models come with an upgraded SE-77 jig for sharpening plane and chisel blades. For plane blades it offers the ability to camber the blades in an extremely controlled way. If you donít know the advantage of clambering plane blades watch the video.
So do you need to get a Tormek? As everyone here will tell you, no you donít. Everyone will tell you they are satisfied with their results doing it whatever way they choose to sharpen. If you want absolute control and repeatability of sharpening just about any tool in your workshop or home, and you have the money to spend, then why not.
In woodworking there is always more then one way to accomplish something.