Honda's basic middleweight (well, in old currency a 400 was considered a middleweight!) with a motor derived from the 305/325/360 twins before it. As long as it has some kind of service history which shows that PO/s have taken good care of it's 'care and feeding' (especially oil changes) and as long as everything is there you should be good to go.
As with any previously owned purchase make sure that the consumables (tyres, chain/sprockets, battery, filters, brake pads/shoes) are in good shape. Having to replace these after the purchase can make that 'cheap' gem into an 'expensive' nightmare! Or figure said cost into your purchase price.
Do a thorough check of the electrical system, especially the charging circuits.