In my situation it is worth having. I have the 22lr and 17 barrel. I do not change them frequently, but I do switch them out certain times of year depending on what I'm shooting and hunting. Both of mine are very accurate. It is not somethings I would want to do every week, but a few times a year I switch to 17. Worth it to me unless I start needing 17 more often. Then I will buy a dedicated 17.
if a 22lr will cover your rimfire needs, don't buy the other barrels cause you will never use them. Just buy the 452
