If someone handed you your own guitar strung with these string for the first time, chances are that you'd thing these are the pure nickel strings you always used (unless you use any type of Fender wire ropes...).
For roundwounds my prefered brand is Dunlop, the sound, the tension, the durability, suit me perfectly, these Pyramid strings remind me of Ernie Ball strings, generally flexible wound strings, full sound, not dull, but with not much of the metallic character of other strings, which is totally expected from any pure nickel string.
I've put these in my Strat and Tele and they work just fine, no broken strings, no intonation or tuning problems, proper volume consistency from string to string, so great!
Just keep in mind that the package is not air-shielded, so if you buy a lot of packs keep them in a very dry box/drawer and they will stay fresh for months and months!
I don't intend to replace my favorite guitar's Dunlops with these, but I have a lot of guitars and also a small studio, so as I have found no issue with them, I can now have always fresh strings on my record-ready guitars and have some spare sets if a guitarist breaks a string or comes with dead strings.
Finally, note that these are not "cheap" strings, they are cheap at thomann because they are made in germany so no importing costs and extra taxes.