Well Sixstringpoet, String spacing is one of my main concerns, I have an Ibanez 506 and it's a pretty good bass but the string spacing is a bit tight for slap playing. I do slap with it and it works out ok but I don't want to make the mistake of getting another bass where I don't like the string spacing. I'm leaning toward the Ibanez BTB 556, I havn't played on one because none of the music stores I've checked have it in stock and would have to order it in for me but it seems like a beter quality bass.