... I'm sure they bow horribly. ...
The Dirty Guts don't bow as badly as you might think ...
I guess no one believed me, I have been saying this for about 5 years... SBW Deluxe Dirty Guts bow really well -- actually decently -- compared to the other synthetics that I've tried. I suspect the bowing capability (and some of the pizz tone) is a result of the spiral cut for the length of the strings. Worth emphasizing, the SBW DELUXE Dirty Guts are the strings we're talking about -- the standard Dirty Guts are smooth like most wackers and may not bow as well.
Whatever the case, my only problem with Deluxe Dirty Guts -- on my DB -- is that their E and A strings (no matter the gauge from their bump pack) just never sounded clear or loud enough, so that's why I went with SilverSlaps for my E and A. The Deluxe Dirty Gut D and G have always sounded great. That said, I made the "not clear or loud enough" E and A observations before I had changed my sound post, so I may sometime in the future find that they aren't that bad after all, and go back to a full Deluxe Dirty Guts set.
More or less as Quantum Bass Center said, if you can get past the stigma of using strings that cost significantly less than $100, and if you can get past the stigma of strings that are primarily made of gator line, they actually sound, feel, look -- and bow -- like real guts, and rather nicely at that.