They're very good but they do take some breaking in.
Back in the day we used sump oil to speed up the break in period. Just slop it on trying not to get it all over your bike. Let it soak for a while and wipe it off and then go for a ride using some old shorts.
If I had to break one in now I would use something like this instead of sump oil.
Obenauf's Leather OiL
From memory they have a real life time warranty. I don't know if they still do.
Once you have them broken in you wont want anything else although a good Italian made saddle can be just as good but not as durable.