Spiro starks are interesting strings, IMO. Like the other spiros I don't think that in and of themselves they're *hard* to bow, but they don't bow like other strings do. Of course a lot depends on the bass; if the setup is bad they're going to be murder to play so there'd be no point, and I think the combination of tension and stiffness probably just chokes the life out of many instruments (or threatens to break them in half). Pretty hard to go wrong with the stark E though - it's a beast and seems to work well with many other strings. For a while I used a stark E with the medium A, and superflexible D/G and that made for a nice all-around combo.
So I guess it'd be the odd bass, in general, that I'd put starks on for regular use - but if I found a bass that responded well to them and had a good enough setup that I could live with them, I think that bass would likely work well in just about any musical situation out there... My $.02...
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