I have the Legacy Arden. I’ve had good luck with the Pass XA30.5 and more recently a Primaluna Evo 300 power amp.
My listening sessions tend to be jazz based and at moderate to lower levels, and the Primaluna is great in this scenario, however I don’t feel that it’s the best pairing for those who like to rock out at high volume. If you are the type to listen at high volume, I’d recommend a solid state amp with high damping factor to get a grip on that 15” driver.