Compared with buying a new mono pair at around €3,643–€4,771, €4,400 for a used pair is not a bargain; it’s upper-fair to slightly ambitious unless the listing is exceptionally clean and includes original packaging, receipt, and recent service. The obvious alternative at this money is either a new entry in the same family or a broader search of the used market, where asking prices around €3,990 and €4,400 show this model can sit in that zone when condition is strong.
The reason to buy is simple: these are well-regarded 8W class-A triode monoblocks, and the Achilles Ultra version adds the better parts and execution that enthusiasts pay for. If this set is original-owner, lightly used, and complete, the appeal is the synergy of low-power purity, rich tone, and strong build in a compact mono format. At €4,400, I’d want proof of health and freshness, but a properly cared-for pair can still be a very worthwhile buy.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.