I'm a long time Ruark fan. Not familar with the Icons, but own Ruark Epilogue II's (small standmounts MA Silver One size) and Talisman III's (floorstanders Neat Motive SX1 size). IMO Ruarks are fantastic speakers - very musical indeed, excellent pace, rhythm and timing, albeit very slightly forward/bright, so partner well with a more lush rounded amp, or at least neutral.
There are pros and cons going used. I've found with the Ruarks that some I viewed (and one pair I bought) weren't that well looked after, but another pair I bought (& the Talismans) were mint and epic bargains that easily outperform new speakers for the same money.
My general rules are;
How well/detailed is the seller's listing? Has it been copied and pasted from a manufacturer's website or is the seller clearly an enthusiast who's described the speaker accurately in his own words? This can indicate whether someone's just flogging another box or whether they're an enthusiast who's taken care of their pride & joy.
Age. As a speaker gets older the rubber seals can go, but the speakers I bought were among the last Ruark made before they sadly diversified away from making proper speakers, so are between 10 & 12 years old. A ten-year old speaker that's been looked after should have many more years of life left, but a speaker that age where the corners have been repeatedly knocked about may not weather so well, so I'd personally walk away if it's not mint.
But if you're sensible and patient, you can definitely grab a bargain used. I bought my Talisman III's from a dealer, Hifi Hangar in Hampshire. Very confident about buying from them - they were real enthusiasts who wanted me not just to listen to the speakers I bought, but others they had in the shop too, just because they wanted to, and even though it was past their closing time. So places like that can be sound places to check out, beyond the usual Gumtree/Ebay suspects.