Hi Chris,
Your RL7000's are the updated model of the RL140s Adam mentioned - well worth restoring and should sound great if you have a receiver powerful enough to make the most of them.
I own a pair of RL6000's (update of 60.2's) which sound excellent to me and previous threads on here show that there are many other fans out there.
The distinctive design of the speakers is probably a bit subjective and obviously they are large compared with the active speakers which repaced them. I find mine to be a good match for my Beocenter 8500 and while i sometimes think about swapping for newer Beolab 4000's i think i would lose out on the deeper bass of the redlines.
In the Redine range i think the ones to avoid would be the RL35/RL1000's which were the smallest and cheapest in the range and possibly the RL45 and RL60 before the .2 updates to remove the ABR. I believe the earlier speakers suffered from foam rot to the 'auxiliary bass radiator' inside the cabinet which was replaced with a port on the later versions (x.2 models and x000 models).