I remember at first, I didn't believe the hype. Supposedly Andre Agassi, Steffi Graf, and active pros like Sam Querrey, Donald Young were quite excited about the Hyper-G and were using it voluntarily.
Initially, when I tried the string short after its launch, it felt like a mixture of muted and plasticky. After a few more tries later on I started getting used to it, and gave it a go at a clay court season prep tournament. Despite slow, uncomfortable conditions (wet, cold, windy), the string produced good pop and pretty sound all-around results.
Switching back and forth with the Tour Bite for a while, it was apparent that the Hyper-G by couldn't get close to the Bite's grab on the ball, but was much more powerful. Over the years, I've tried stringing up the Tour Bite very loosely to make up for its lack of power, but always felt I had trouble getting the ball through the court.
Also, the Tour Bite reaches a point where it gets tough on the arm - maybe over 22 kgs string bed tension (so ~ >24 kgs pulled). The Hyper-G stiffens up too, but maybe around 1 lbs higher, but does not hurt as much :)
Compared to the average string, the Hyper-G can produce a good amount of spin, so that ended up being the compromise for the last year.
The biggest positive surprise came when I picked up Hyper-G racquets that I hadn't used for months. They still played very nicely, subjectively sometimes even better than fresher string jobs. So while I cut out any other poly after 5 hits max, the Hyper-G can probably stay in twice as long. If you don't play as much and/or are not as picky, you might be happy getting it restrung once per season (so 4 times a year).
Bottom line, the Hyper-G is still in my top 3, along with the Cyclone and the Tour Bite. At the end, the orange Cyclone still wins for me since it grabs the ball better. When it comes to matchplay, you trade that off with a quickly degrading life span, both in terms of tension and ball grab. So after 2 competitive matches, it's due for a match-day restring.
How to think about price? Well, depending on the market, there seems to be a ~20 - ~50% premium compared to the Cyclone or comparable strings like the Gamma Moto. Its priced similarly to comparable Tecnifibre strings and the oldie (and for some goldie) RPM Blast... unless you're e.g. in the US. If you intend to keep the Hyper-G in your racquet for a while, your "cost per decent-feeling hit" might come out cheaper than most of the competition.
For more thoughts around strings, click the "string" label below.
You can also dive into my string jobs over the last ~10 years, including ratings and impressions, here.
For more thoughts around strings, click the "string" label below.
You can also dive into my string jobs over the last ~10 years, including ratings and impressions, here.