Testing the SF/02 laser rangefinder on a Pixhawk on my Meridian. Worked very nicely! Some results:
The baro showed a bit higher than the laser, but the laser was definitely much more accurate - the baro was affected quite a bit by the speed of the plane causing low pressure in the fuselage.
I connected it to the Pixhawk using the analog connection, on one of the two 3.3V ADC connectors. That gives very good resolution, and low noise.
Once PulsedLight's LIDAR-Lite changes to using a laser (as they plan to do) and fix the short range and long range issues (bad values at ranges below 1.5m and bad values at long ranges) I hope the two will have similar performance, and the I2C connection on the PulsedLight module will be a better fit. The LIDAR-Lite prototype I have now has a range of about 12m compared to 40m for the SF/02, and gives bad data at short and long ranges, so right now the SF/02 is better for the work I'm doing on landing, but longer term I'm hoping the LIDAR-Lite will be a great option
There is more discussion of this on the DIY Drones Dev list here.