For years I used rotobass nickles, I also had set of Tru-bass on my jazz and a set of jazz flats on my ray when I sold it. I've never really had a problem with Rotosound and the only reason I have changed is that I've either been given strings or picked them up at a bargain price. I got given a set of D'addario nickles when I bought the Warwick and in my opinion they are no better then the Rotobass nickles. I also got a set of Ernie Ball flatwounds (that are currently on my Warwick) for about £10 which are nice strings, not as zingy as the Roto Jazz flats but good for the blues. I recently bought 2 sets of Dunlop nickle strings off ebay for £3 each and they are sweet, I'll probably end up getting more. I've used Elites, Hartke and Picato which were good but had a few probs with Roberts and Elixier. The Roberts flatwound sounded dead and the ball ends of the Elixiers didn't fit into the tail of the Warwick very well.