My boss asked me to read the recommendation letter he wrote for me asking if he was able to cover all the needed things (one of the schools i applied to require recommenders to comment on the applicant's commitment to public service, etc).
Some recommenders would even ask you to write a recommendation for yourself and they would just tweak it..
As for the other profs, I waived my right to read them so crossing my fingers they wrote nice things. hahaha