I like using these so much a own two of them.  They are very useful.  I also use the orange swivel pegs that help holding things that have different angles.  The swivel pegs come 4 in a pack.  One thing is that they are pretty portable and pretty easy to put together.  You have to had a few part to main frame and thats about it.  They give a list of tools needed and once we guys finally read the directions it goes very quickly.  Just take it for what it is.  If you have a professional carpenter rate it I'm sure they'ed say it sucks but  for the average homeowner,  do it all people I think it's great.