Not sure how many varieties there are, but I have used Tried and True, I believe mine is the "original wood finish." It is in a can, and says it is polymerized linseed oil and beeswax. Is this the one you are thinking about?
A few years ago, when I started my first dulcimer (an HD that I never managed to finish,) I had a talk with a guy who worked at my local WoodCraft store. He was a luthier, who made HD's. I asked him what was best to use, and that was what he sugguested. So I bought a can.
I haven't finished a dulcimer with it, but have used it on some small projects. Mostly on anything that will take some abuse, and need to be real flexible. Namely, bones and spoons of the musical variety (my group plays lots of Irish music!)
If you follow the instructions, the stuff is real easy to use. Just remember to use VERY thin coats. I usually put on one, let it sit overnight, then do a couple more. I have been very satisfied with the results, it has held up well under the constant handling of the bones. It gives a nice finish, not glossy but a smooth finish that feels wonderful to the touch!
My only caution is to make sure you have everything sanded like you want it before you apply the first coat. Once it's on, it's impossible to sand!