I've owned Vectronix Terrapin, Swaro Laser Guide, Newcom 1800S and some cheaper bushnell POS. I bought them in the the opposite order that I listed them in, all of them but the Terrapin has let me down. The Newcom was a joke. The Swaro was a really good range finder for less than 1000yds in most conditions and out to 1500 in great conditions. If I could of afforded it I would have kept the Swaro for a hunting rangefinder as its smaller and lighter that the Terrapin. The Terraoin has been great, the best part is it also works well in bad conditions. I was out one morning in the fog and ranged a steel plate at 800yds that I could barely see, it had no problem. The furthest it ranged is a cow at 3400 yrds but I'm told that they can go even further. I have never tried.
For the money the bushnell Arc's are great.