Read more and see photos via the source link. Source: http://diydrones.com/profiles/blogs/sf02-laser-altimeter-review
This guy has done a flight test with this laser rangefinder and has flown it and charted it against a barometric sensor and ultrasonic rangefinder. Interesting stuff! http://diydrones.com/profiles/blogs/laser-rangefinder-flights-tests-in-namibia-1
He mentions in the article that he will be replacing the ultrasonic sensor with the laser rangefinder, I presume he is keeping the barometric sensor, at least that's how I understood it.
Me too. I didn't think these barometric sensors were very accurate. I think the laser is more accurate for landing. I guess redundancy is good too.