before I changed rims they held air fine. but on the 25mm rims the front would last two or three days before it got to 30 psi. I have used it for maybe a month or more daily riding 18 miles a day. the back did fine till it got the hole in two tires In the sidewall. I dont know of the back two tires had a hump but the front one did and a giant puss pocket where the two layers separated. but the back replacement I was lucky if I could make it 10 miles the first couple rides without having to add air. but it got worse I had to stop twice to fill it and it had even worse hump.
these tires felt soft till they were on the bike then they we not soft at all. it was a bit strange. with tubes they were even worse.