Frogeye,
Quite right a laser is only as good as its accuracy. A spirit level is only as good as its accuracy which may indeed have less error tollerence. However it is also coupled with the user innaccuracy. I did the PTS course and can say that transferring a line around a room with a spirit level is a pain. I challenge anyone to do it and get back to where they started from within a mm, ie less than their pencil line. Now, put a pole in the middle of the room, put on your laser level, spin it around and job done, starts and finishes in the same place, spot on. Buy good gear, look after it and it looks after you and saves you alot of time and time is money!
