Jet is a decent brand for an import lathe. Personally I think the price is high for a 10" lathe.
You can get a brand new Precision Matthews 10x22 or 10x30 lathe with pretty much the same tooling for a couple hundred more, or a Grizzly 10x22 similarly equipped for a few hundred less.
Advantage to a new import lathe is they are new, if you have an issue the seller is available to fix the problem (assuming you buy from a reputable seller, not a fly by night online or ebay seller). A new lathe you can start using, there may be improvements to make, but you are not buying a project.
Precision Matthews has a good reputation, Grizzly is lower down the chain, but still a generally good reputation. Jet is marketed more towards industrial users, and the prices tend to be higher, but another well regarded brand.
The problem with old US made lathes is they are old. Even newish ones are mostly from the late 70s to mid 80s so still 35-45 years old. Parts are still fairly available for many, but not cheap.
If they are in really good shape they can command a premium, and even in major project shape, many sellers try to get a premium price. There are some bargains out there, but you need to be experienced enough to tell a bargain, from shiny junk.
The old American machines legitimately earn their reputations. I have a late model Powermatic Logan 10x24 and it weighs nearly 3x as much as a similar sized import lathe. Cast iron and steel vs aluminum and plastic. It also took me several months to get it into halfway decent operating condition, but it was bargain priced so I'm not complaining.