OK that barely passed for a mini review, it was just for me to justify the tool acquisition, err cost. And now I feel better. ;D
Could have got by with a plumb bob. And have an old Shop Tool laser something that makes a nice fat line (oh boy !) and takes forever to level and confirm. And if you need to relocate it, well
Like Mike says the PLS 2e, now the PLS3 I think is the same without the 180. For a self leveler - $169.00 US is not that bad.
I put off getting this because I thought it would be an extravagant gadget that would only be used rarely. Same way I felt before I bought my first nail gun a Senco finish pro 41xp. Banging nails with a hammer is only so much fun.

It might still be an extravagant gadget but it sure is nice to have.
The basic unit comes in a hard plastic case and has the magnetic "L" bracket with mounting screw bolt - 1/4" 20
Also comes with a nice little padded case. And a manual that I have yet to read.
The set up buttons have a red - green light to verify the self leveling feature. The 180 feature is real nice and makes easy and fast work of marking or verifying complete around the room layout. Floor - ceiling also. It has an internal compass like level I think but I won't be taking it appart to confirm that. I can see that dropping it would not be a good thing but it feels solid.
This helps you by making your work seamless, without interruption to measure ,verify recheck. So your work is checked in "real time" as you go. (OK now that sounds more like a review) Must have read that somewhere else. :

You can leave it on as long as you need to.
Dan, hope your project is moving along well. I have been reading up on the John Bridge Tile forum and would not have attempted this without that info. The forum makes it possible for me to attempt this tile job and the laser is helping to insure a quality job. I'm using DensShield tilebacker with Latacrete 254 Platinum thinset.
Finished the floor with 12" porcelain tiles over 1/4" hardiboard. Yep there is thinset between the hardi and sub floor. ;D I used Spectralock grout - very very good stuff. Easy to use. Looks great. Going to use it on the walls also with a color match.