A friend of mine has one and I also brought one back from America a few years back for someone else and they both love them. They are nice guitars and very pretty. Not in love with vintage tuners with plastic buttons (my Gibson came with those and I had to replace them as they were way too fragile).
The pickups are good and full sounding.
The only downside is that some of them use a weird screw connector for the cable, but you can get adapters or even change it for a regular jack so not too much of a problem.
There's one up on Ebay right now for £1050 but for that price you could buy a double 8 Fender which would be my preference, but if you prefer the look of the National, you won't be disappointed. I think the Fenders are more solidly built if you're thinking of doing a lot of gigging with it.
To me the Fender models (or Gibson Console Grande) are the classic double 8 guitars but the Nationals and Rickenbackers are really cool too. Never met a vintage steel I didn't like
