Question: Is a Viktor Berbekucz feder worth buying?
My verdict: Yes – it’s not bad, you can’t go too far wrong with it.
The feders by Viktor Berbekucz are not bad training tools, and if you have the opportunity to acquire one, you can’t go too far wrong with it. They are perhaps a little more flexible than would be ideal, but this is significantly better than being too stiff.
These training swords have been becoming more popular in North America and throughout Europe over the last year or so, and while they are not as ubiquitous as some other makes, they are becoming fairly common, which is always a good sign.
Motivation and transparency
I have one of these swords, which I won in a competition. I have used it a little. I wouldn’t mind any of my students coming along to my club with one of these.
(Edit: this “motivation” section was added on the 9th of March 2019, as part of an effort to improve the transparency of the various reviews on this website.)

Keith Farrell teaches HEMA professionally, often at international events (why not hire me to teach at your event?), and has an interest in coaching instructors to become better teachers. I teach regularly at Liverpool HEMA, and help behind the scenes with running HEMA in Glasgow at the Vanguard Centre.
I have authored Scottish Broadsword and British Singlestick and the award-winning AHA German Longsword Study Guide, and maintain a blog at www.keithfarrell.net where I post regularly.