Rotosound PN9 Pure Nickels

Long Story Short Version:
They're VERY good, try them.

Long Story Version:
Over 30 years playing I've used just about every expensive string out there, and most cheap ones as well.
These Rotosound PN9 Pure Nickels, for me, are the best.

When using nickel-plated steel strings I could always hear some weird, metallic bright tone I didn't like from the low strings (it took me years to work out it was the strings, and not the pick, amp, or guitar).

Using stainless steel strings sounded more like a Banjo, not a guitar (I played Banjo also for about 20 years, so please don't hate me Banjo players).

Trying Rotosound PN9 Pure Nickel strings was a TONE REVELATION for me.
NO weird, metallic bright tone from low strings.
Much nicer tone (like I always wanted to hear), NEVER had a string break in all the many, many years I've been using them, they last a lot longer than nickel-plated steel before a string change is needed because of dull tone or string wear/gunking up (technical term). They also feel good to play, in a smooth, supple, sexy sort of way (I better stop there before I get deleted).

Stay in tune well. And as well as any other string brand once stretched out.*

Also, those treated paper envelopes that some other string brands come in make my eyes itchy. I mean VERY itchy, as in some sort of allergic reaction.
The foil packets Rotosound strings come in are better and cause NO reaction/itchiness.

Cons:
I have noticed that, once in a blue moon, a set of these strings may need more stretching out to stay in tune well for string bends etc.
Most of the time these Rotosound PN9 Pure Nickels tune up very quickly and stay in tune well, but sometimes I will get a set that requires twice as much stretching out before they give the tuning stability I expect.

Verdict:
Excellent strings. You are basically buying a packet full of TONE.
They feel good playing, last longer than most expensive 'Long Life' strings I have used, never had one break or come undone at the ball end (I'm not going there), and stay in tune.
Also, they are WAY cheaper from Thomann than other places.

If your budget allows, I recommend trying a set. You might just love them.

j'ai plutot l'habitude d'acheter du pyramid et la suite a l'achat de rotosound nylon black pour ma basse j'ai eu envie d'essayer en guitare..
les cordes sonnent plutot tres bien, bon rendu haut medium, solides..je casse pas souvent mais fait pas de cadeau non plus
je suis a 3 mois d'utilisation et ais pas trouvé utile de les changer..je joue une heure par jour en moyenne..juste un petit bemol.. je trouve les basses moins bien que les pyramid..mais bon ca peu etre subjectif

Bin seit kurzem großer Fan aller RotoSound-Saiten und habe mit meiner Telecaster diese pure nickels ausprobiert.

Vom Sound und feeling her finde ich sie großartig. Allerdings ist mir nach ca. 3 Wochen (mit exzessiven spielen) die B-Seite gerissen.

Das ist mir schon seit Jahren nicht mehr passiert und werde daher wohl wieder zu den Stahl- bzw. vernickelten Stahlseiten von RotoSound zurück wechseln. Bin zwar kein Profi, aber ich könnte mir vorstellen das die pure nickels vielleicht eher für gemächlicheres Spielen geeignet sind, da sie scheinbar nicht so reißfest sind wie Stahlseiten.