We haven't done this in a while.
DD1 is in a pair of Graco high back turbo boosters for the time being. When we go on our next road trip she go back in the Frontier 80 (if we can get a good fit in our Passat) and she'll stay in that until we need to move the seat for some reason or DD2 outgrows the RA55 (and then DD2 will go in that harnessed).
The Harmony Cruz is our spare booster.
DD2 is in a Britax RA55, Britax BLVD70, and uses a Safegaurd Go occasionally for air travel.
I would love to get rid of both of the Turbos in favor of something more comfortable as DD1 loves the comfort of the Frontier, but I really can't justify the cost now, and the Turbos for most of our driving needs work just fine.