I used to use only Obligato strings for a few years, and then started experimenting with others, particularly Eva Gold, and Perpetual. However, the G strings always sounded harsh and "cracked" when trying to play high on the string. So I bought an Obligato G and the old sweet, solid warm sound returned with no cracking. It may just be how it works on my violin, but I think i'll stick with it. Next want to try going back to the Obligato D.