This tool is fantastic it does so much I will start at what my opinion is then we can get more into the details.  The tool is very handy you can set it to a specific set of inches and set the same line over and over again and different projects.  There is a brass nut you can see on the picture and that lets make it a 45 degree angle.  Or even a 90 degree angle.  There is so many more types ways to use it.  I have had this tool for about a month now and really wonder why I didn't get it sooner.  The functionality is usable and diverse and for under $20 you really cant go wrong.  I would give it 5/5 If not for price and usability.  but the plastic casing is pretty hard and is going to hold up as well.

         I don't know exactly how well I will be at doing the details.  As I go along using tools to make my projects I have to advance my self and get new ones.  One of the new ones I have recently acquired is a Dewalt 735x planer. It has been really nice to be able to use it.  I may have been a little to excited when I got it but, now I know why.  It really is a smooth machine and can really go through boards smoothly.  I had used other planers before.  One was a dewalt and another was one you use in school workshop.  So even though they were not extensive uses of other brands I still would rate this one way up there.  The only downfall I have for it is a 13 inch planer and I have some pieces that are bigger.  That is not a downfall of the machine just a downfall on what I was able to purchase size wise.  I have  put plenty of boards through the planer already and takes them all through smoothly. 
​       I would really recommend this to people with small shops or small works spaces.  A nice machine can make all the difference in what you are making.  It can speed you up help the wood not get dinged
or snyped.   The only time I had some snype was when I was running some 10 ft long boards through the planer.  If I had asked for some help maybe I wouldn't of snyped the piece.   It got jammed in the fan area and that is really easy to fix by taking off the cover and cleaning it out.  The whole piece is very user friendly and a piece of equipment.  So all in all I would give this planer a 5/5 stars. 

Update
​so I started plaining some six inch boards I  thickness  and I am still loving it.  I really would have no complaints.