Never heard of them, but they are a good looking boot. I looked them up and they have been in the boot business a long time and are very respected in the mountaineering circle. Them krauts do know how to make a good boot.
I haven't owned them, but I've read nothing by rave reviews of them when I see them mentioned online. I know that's not a ton of help, but I personally would buy them if I tried them and they felt good/fit well.
I use Meindl boots (Cabela's branded, but Meindl made) and Asolo boots. Both are excellent. I hear Hanwag mentioned often and with praise, along with Kennetrek.