Floyd,
I've got a Delta (the old metal ones, not the newer cheap plastic jobs). 60" blade two wheel. When adjusted correctly it cuts very straight with a 3/8" 16 tooth per inch blade. Great for cutting pieces like leading and trailing edges, spars and a host of other stuff. As I say, I don't use the jig saw much, but I'm glad I have it. It's one of those: you don't need it much but when you need it, you really, really need it.