I'm sure there's many people who would claim a vast difference between these strings and strings of 10x the price but I really don't hear it myself. They are perfectly acceptable synthetic nylon strings for acoustics.
I am quite close to just buying loads of packs of HB strings as strings, for me, in the past were always a mournful thing to buy, 10 euros a pop or thereabouts in the local shop and, while not bank-breaking, if you have many guitars (as I do) then it soon begins to add up.
I'm really glad HB started this no frills string range but, unlike most "no frills" brands, these are actually really good quality, in my eyes. I can't really think of anything negative to say about them. They hold their tone well and are well made strings, nothing wrong with them whatsoever.
I think it's a good idea to always have a few packs of these laying around. For the price they're an absolute steal (like a lot of Harley Benton stuff) and considering you can buy many packs for the price of 1 pack of "big name" strings it seems nonsensical not to go with this option. Give them a try sometime, it's hardly going to break the bank, and I'm sure you will be pleasantly surprised.
I only wish HB did string packs for 7 string guitars but I guess their strength lies in the volume of production runs and 7 strings are always "a bit on the periphery" in terms of people needing parts etc.
Anyway, definitely pick some of these up and try to spot the difference with much more expensive brands, I would say you'll notice very little considering the difference in price !