No problems with my Swarovski so far, after 3 years. It ranges to 1650 - 1700 yds pretty consistently.
In spite of that, when the new Leica 1600 comes out, I'll probably have one, due to the barometer, temperature, and inclination features it reportedly comes with.
I've had the Leica 1200 Scan LRF before and the Swarovski glass is definitely better. Good enough that I will often leave the binoculars at the house for one day hunts and simply use the Swaro as a monocular. I wouldn't do that with the Leica 1200 Scan because the glass wasn't quite sufficient for my liking. But I'll be willing to downgrade on glass quality to obtain 1600 yd ranging, pressure, temperature, and inclination/declination data with the Leica 1600. IF it will range to at least 1500 yds. My Leica 1200 wouldn't reach 700 yds on some mountainsides. Never a miss out to 1200 yds with the Swaro. And generally 1600 plus yds.
Buy a Swaro now, or wait for the Leica 1600 to be field tested if atmospheric pressure, temperature, and inclination data are valued. The new model Leica is supposed to be available around the first of May - based on the best rumors I've read.