OK folks, here's why I love my set of D'Addario Helicore Hybrid strings. Basically, they feel good, sound good, stay in tune, and brought my bass (Franz Hoffmann Prelude) to life. They've got great response to both arco and pizz and so far, will stand up to the most demanding play. Heck, I've already turned my teacher on to them (he's going to replace his 8 year old Red Wraps with Helicores), and another bassist is interested in the strings and is going to try them on my bass. Plus, with the lighter tension than Spirocores, they'll give the Spiros a real run for their money, and speaking of money, about $80-100 less than Spiros.