I have put two different sets of Helicores on two different Engelhardts. I put a set of Helicore Hybrids on the Engel I play at work and the Helicore Orchestra strings on my personal Engel. I find the Hybrids to be really twangy and not good for bowing at all. They are harsh and not what i thought they would be. I was expecting a much better bowing experience out of them....uh no. But surprisingly I really like the Helicore Orchestra strings and the arco is pretty good and I think I like the pizz better on the Orchestra strings too. The tone is much fuller and warmer to me than what the Hybrids offer. I am sure that a better bass might give up better results but from what I have experienced, I don't think I am a fan of the Hybrids, but I may get another set of Orchestra Helicores if I continue to like them as much as I do now.