I'm in Europe. The best I've seen are from Pulsar and Leica.
I have the Krypton and the smaller Proton around. The Leica Sight is gone now. It's good but the Krypon is better.
People think the Leica Sight clip-on is as good as the Leica View (monocular), but there's a huge difference.
My friend rang steel at 900 meters with the Krypton. I only manged 500 meters so far.
Swarovski will soon release theirs, but I hoenstly don't understand how they're going to survive looking at the specs (low) and price (highest). But their aim was to make is as simple as possible, or they ran out or R&D money and pitched it.
Pulsar's latest creation is called the Pulsar Krypton FXG50, and it's a clip-on front attachment for the riflescope(s) that you already own.
www.thefirearmblog.com
and because I could
Photo Of The Day - we have the Tikka TAC A1 in 6.5 Creedmoor and a Spuhr mount to carry the heavy burden of the Schmidt & Bender 5-4556 PMII with Pulsar Krypton FXG50 Thermal Clip-On.
www.thefirearmblog.com