Pyramid 7String Classical Guitar Set

This is the second time I’ve purchased this set of strings for a 7-string guitar, and I decided to buy it again just to make sure I wasn’t being unfair in my first judgment.

The first issue is that these strings struggle to hold tuning right after being installed, even when using well-known techniques to stretch and stabilise them properly. The problem is not with the tuning pegs, but with the strings themselves.
Another major downside is durability: the D, A, and E strings oxidise and wear out very quickly, becoming rough in a short period of time. In addition, the outer metal winding of these strings tends to break apart in several spots, which not only affects the sound quality but also makes playing uncomfortable. As a result, replacing the set becomes necessary much sooner than expected, only to face the same problem again.
Overall, this set of strings did not meet my expectations, mainly due to its poor construction quality and short lifespan.

These strings are a very good deal. I do not own a 7-string classical guitar. Rather, I bought these to experiment with lower tunings (ie B to b) on a standard classical guitar. With that in mind, I cannot comment on how they sound on the instrument for which they were intended.

On my guitar, the strings have a(n obviously) powerful low-end. Quite nice and resonant.

However, brilliance lacked with the lighter gauges; certain chord voicings sounded very "muddy." I can't blame this on the strings, alone, since I am using them on a slightly shorter scale length than what they are intended for. For the price, I cannot complain, and will surely order another set to have on-hand for future experimenting and inspiration.