I will make changes, but it gives something you can rely on. It's a basic. In the beginning I start to improvise but i try to make the solo with a beginning, middle section and end. When you're just improvising it's nice when you're jamming along. I'm not that good to make a good solo instantly on stage. Working on a solo gives me the opportunity to let in new techniques and sounds. It's also good to record that kind of sessions for just that little thing you can't remember, especially after taking alcohol etc.
I love playing after a copple of beers, I can go on for hours, but if people like it when i do that on stage, I don't think so.