Like
@lostinthelight I too use a deWalt DCE089G (the green version, as opposed to the cheaper red version). Mine displaced an earlier 3-axis Bosch GLL3-80P red 3-axis laser, which these days is still my backup.
As you can see neither is pristine.
I chose the DW because it had a replaceable battery system, as opposed to AA cells, which I have always found to have a tendency to leak in long term storage, or built-in batteries with a USB charger port which always run out of power (on me) when I am trying to finish a job, that and because it was a green line laser, so better visibility in brighter light conditions than red line lasers. 3 x 360° was simply replacing like with like. When I looked at a new 3-axis small green Bosch I simply couldn't justify the expense at the time (The GLL3-80CG is currently about £500 as opposed to £400 for the DW).
The DW has been a good choice because as LITL says, they do the job and are very robust; mine has had the inevitable few tumbles onto concrete on site, so far without incident and without the level going out at all. Please don't take this the wrong way, but when I posted I just wasn't sure about recommending a £400 laser set to a DIYer who may be on a tighter budget than a tradesman, and who might not benefit from all of the features
TBH the 3rd axis isn't useful all that often, but it is invaluable for tasks such as installing jib doors (the type of doors you see in public buildings which swing both ways and are mounted on a spring box in the floor), for installing bulkheads and for tasks like drilling holes for soil stacks - however, none of these are things a DIYer would do, surely? But I can see how a tiler might be able to use a cross line on the floor or a sparky could use projection of crossed lines on the ceiling to set-up lights (especially those multiple miniature LEDs which are used in kitchens these days). TBH a 2-axis 360° laser gives me all that I need for 95% of my work and before I had the Bosch GLL3 I actually had a Leica Lino L2 cross line laser, which was a bit less convenient, but more than adequate for installing kitchens, bathrooms, floor joists, etc. And before that I worked with a spirit level, plumb bob and chalk line for decades. So before you buy a 3-axis laser I would ask yourself just how much use you'll get out of it
In terms of the lasers you see around on site, I'd have to say that DW are the most popular brand by far - I bought my DCE089 having seen the dry liners on 3 jobs using them and been suitably impressed - and many joiners I have worked with over the last 10 years had DW cross line lasers (the DW088 especially). The next most popular brand seems to be Bosch (blue). This is probably because they are widely available and offer some backup should you need to get them recalibrated. PLS lasers were popular in shop fitting a few years back, but proved a tad fragile if dropped, as well as unrepairable (USA made and no service facilities in the UK back then - in any case PLS classed the pocket lasers as non-serviceable "consumer items") - most of the guys I recall having them have moved on to either DW or Bosch
