Well, I am still using my Eclipses I bought 33 years ago. Still work fine, and still enjoy them.
Very inefficient: I have each of them biwired to a MC275 mk5. You need a lot of power.
Yes, the bass can be a bit shy. Using Anticables improved that significantly. Currently I am in Mexico helping a friend get cancer treatment, so I cannot look at which flavor I have. But you need one of the higher versions of AntiCables for the woofers.
Also I heard them with subwoofers. Bass issues go away with the right ones.
If you can audition them to see that they are working fine, then you get an awful lot of speaker for $700. From the comments, sorry to see that Avalon isn't the company it used to be. Sounds like you need to make sure that they work before you buy them.