I made them an offer and they countered, so if you are interested try it and save a few dollars over buy it now. Probably with shipping it'll be $100, maybe a little less. I didn't buy them after all, I got Lenzers. No reason to believe that either one is superior, both are probably fairly typical for all guts.
Ken is right, and maybe that's why basses had only 3 strings for a long time. 4 and 5 strings only started making sense when there were alternatives to pure gut.
However, all guts do have a place for the right music. If the note isn't that important, just the boom (and possibly followed by a whack, whack), all guts might be the ticket.
My experience: They are wonderful as long as you don't care too much about pitch or want to bow. Feel great, you can play hard for hours without getting blisters. Good that there isn't that much pitch because they go out of tune all the time anyway (steels stabilize in a few hours, synthetics in a few days, guts never). A bass with all guts is a much closer cousin to the washtub bass than to a cello. I enjoy them for that (and their easiness on the hands), they are fun, and I'll keep them on my beater bass for the right occasions, like this one:
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Gives you an idea of how all guts sound. I'd say no discernible pitch below the D, but they play easy, slap is mellow. That day (a month after I put them on), they still went 1/4 note flat every 20 mins.
Forget about bowing (even the top 2 strings have a very nasal tone to it, hard to start as well - very baroque like, but maybe you care about authenticity. Steel strings spoiled me).
If you are looking for a powerful and clear sound, don't go that way. I have steel strings on my other basses for that reason. Guts are fun to play in the right setting, though.
