I went from the 590s to F35s and wouldn't say it was much of an upgrade. To be fair, I never had them in the same space(different houses). The 590s are probably better suited to my current space than F35s but I'm using the same pre-amp/amp.
I agree with AVKS, as I also enjoyed the 590s more. Both are/were used in the main living rooms for movies/music and paired with 15" HSU subs. I found myself more content listening to music on the 590s and not having the need to turn on the 2 channel system in the other room. Whereas with the F35s now, I hardly use them just for music.
In terms of looks and build quality though the Revels are miles ahead of the JBLs. The footprint is way smaller and a better fit for most living rooms.