In a nutshell rated ...

The spirit level is processed wertig, easy to use and
for normal use DIY perfectly adequate.
The line from the laser actually goes across the room and from floor to ceiling
(Living room with more than 7 meters in length)
and can also be seen very well on the day.
Very good for highlights with wallpaper or paint,
without having to sketch out in pencil.
The only fly in the ointment is, and really the only reason why only 4 stars,
you need to use them for wallpapering and for murals,
optimally a tripod to mount it firmly and actually use the versatility to be able to.
There were just our experience with renovating :-)
Otherwise, strong buy recommendation from me!