chicken's IRC channel taught me scheme. A bunch of very nice people. I have called it the friendliest place online for years.
I ended up having to write some portable r6rs code, and that is easier in guile and chez, so that's why I went. I still feel a bit like I owe them to spread the word. Chicken is a very capable and plenty fast scheme. installing 3rd party software is a lot easier in chicken than any other scheme.
I would say that it is slightly faster than, or just as fast as guile3, but slower than chez.
