I have recently been on a quest to try as many 7 string sets as possible and find the ideal string set for my Schecter Hellraiser Hybrid PT-7. I have been able to try some La Bella strings and even had the chance to meet the La Bella family at Musik Messe exhibitions. I think they are an excellent family business example in this industry.
I also appreciate their effort in delivering more strings with unique features. Having said that, La Bella strings always remind me of an average string quality for the money you pay.
HRS-73 was not so different. I bought these strings to try with drop tunings as the gauge is pretty thick for standard guitar tunings. I must say, even with flat tuning, they feel still so tense. So in my opinion, one should only get these strings for a whole step down tuning.
Even with the whole step down tuning, they feel pretty rough on your fingers since the strings' core is pretty thick to support these kinds of alternative tunings.
Lifespan-wise, they are pretty standard and start corroding quickly and tend to lose the spark very quickly.
Anyways, these are the reasons why I'm giving 4 stars overall. But don't get me wrong, these strings maybe your favourite if you are aiming for drop tunings. I won't be preferring these for my 7 string in the future. If you want to hear how these strings sound, please search the product on Youtube and watch a short demo that I have made.