Whrn I first started buying tools, I always older model equalled worse, newer model equalled better, and used older model equslled worse worse, and newer unused model equals better better.
Since then, I ve come to the conclusion that newer models aren't always designed or built better, or even as well, as models that preceded them, and older models aren't always older, worse, engineered and manufactured tools.
Since Festool still manufactures the OF1400, without any changes, except maybe the T-Lok systainers, and possibly the accessories included with the tool, there should be no difference between an older and newer tool, except wear and tear, and storage conditions.
Routers don't have gear cases, and the only lubrication is going to be the bearings. I'm not sure whether these are the permanently sealed, lubricated type, but my experience is most bearings last well over time if unused, so I'm not sure whether this would be an issue.
Similar routers from other manufacturers seem to cost between $220 for a Hitachi, to $370 for a Porter Cable. I'm guessing for the money, many woodworkers would probably prefer to own and use a Festool router than one of the other "professional brands, but the starting cost is about twice the other routers, not including the cost if accessories. Accessories can also be very expensive, and possibly cost as much as a router has cost. Since those accessories may only be useable with the router for which they were designed, you can't always just buy one brand of router, and then cheaply switch to a different brand without excessive extra cost. If your preference is to own a Festool router, or other tool, purchasing a used but functioning tool for what seems like a high price, and then purchasing the accessories for it would give you your prefered brand at a lower cost. If you hate the tool you can always sell it later for not too much of a loss in value, except maybe Ebay fees. The accessories will probably also hold a decent amount of their value for resale. And if you do like the router, you can always save up, and purchase a new one later and you already have the accessories.