I bought one of these for light duty planing tasks - relieving corners, cutting dowels flush and etc.  You do have to hone the pre-ground edge  before you use it the first time.  It is ground to 25 degrees and  recommended final angle is 30 after honing.  I used a Veritas honing guide  and a Japanese water stone to do the job.  It only took about 5 minutes  with the right tools!