I just received this jig to replace a number of doors for a client and have yet to use it, but wanted to pass on some rather important info to anyone trying to decide between this one and the bosch unit.  I was originally vacillating between them but ended up buying this one merely because my old boss had one years ago, and based on reviews, it sounded less problematic.  I plan to do some tall doors eventually, so I was a little concerned that the fourth-hinge kit is listed as no longer being available but figured that I'd work it out somehow.  What I wanted to pass on to prospective buyers is that the basic kit I just received included the fourth hinge template and rail to accomodate doors up to 8-feet tall.  It also included the corner chisel gizmo for square-cornered hinges.  These extras make it a heck of a deal.  Now all I have to do is use it within the next week to gauge its functionality, and I'll get back to you.  I'm expecting good results but will update it then.