I tried gut strings ($21.95) because I wanted to compare them with the Nylgut strings ($10.95) made by Aquila. The two were startlingly similar in sound, both to the ear and in waveform
If you have nails, you should expect gut strings to last nearly a week. I am given to understand that if you don't have nails a set of gut strings could
last twice that.
Nylgut strings, which do nick, by the bye, are likely to last you as long as any other string. I find I need to change strings roughly once a month, independent of the string.
Both gut and Nylgut are very
bright, which make them particularly attractive to beginners, who, as a rule of thumb, are not yet sophisticated in their hearing. As always, for beginning (and many or most intermediate) students, trying different strings is little more than a hobby, rather than anything actually fruitful, and they would be better served with neutral strings. At the moment I use D'Addario EJ45 Pro Arte strings ($5.99), which are as neutral as they get.