I own a PLS5, it is a good unit. It is a little big compared to some of
the other 4-5 beam units I have used(like hilti's, robotech), the pls2
is smaller though. The other thing is that the two side beams are
offset 1 inch from the up/down beam, so if you want to use it to square
you have to remember to factor in that inch. Overall I think they are
pretty good.