Hey Folks -
Nobody loves buckling springs more than I do, but before you get too excited, think it through. The 122-key layout is not so different, in a lot of ways, but there are some important ones. I like some extra keys at the top (I do not use a half-dozen of them at all, but could) and I have really enjoyed an extra set of F keys on the left.
The Model F-122 is somewhat easier to take apart and put back together in order to move things around for a near-ANSI layout (assuming that is what you want in North America) but taking the M-122 apart to move springs is going to involve cutting rivets and doing a bolt-mod.
You will probably also need something like a Teensy $20 and some associated wring work there.
If these things are selling cheap, including shipping (no small issue when our Canadian friends are involved) then great (sounds like "tire store = abuse" to me, however) but this may not be something that pleases you right out of the box.
If you "have always wanted to try out a Model M" I would recommend buying a standard one instead, and plugging it in for standard use straightaway.