I will try to answer your question as unbiased as I can.
To begin, I work with the fine folks at Artisan - I want you to know that right out front.
Having said that, I can tell you I know John Leighton and used to sell him a lot of equipment from the 70's until I joined Artisan a year ago.
John is a very nice person and has been selling Industrial Sewing Machines for a very long time.
To the best of my knowledge, his Mach 1 is imported directly from China. In order for you to import the machine without any duties, you will need a NAFTA certificate stating the country of origin was Canada (not China). John may well do this for you - and it will be your decision if you want to go that route.
If you look at the info published by John, the claim is the machine will sew up to 1/2" of leather. The Toro will easily sew 3/4".
The Mach 1 is shipped with a clutch motor - The Toro is shipped with an Electronic Servo Motor. While an experienced operator can 'feather' a treadle to attain a similar but not identical 'stitch by stitch' effect, why order a new machine with outdated technology?
Every Toro is shipped with extra needles, an extra spool of thread, a high tech Halogen lamp....and on and on. Not to mention lifetime access to our Customer Service Department - where you actually speak to a real person immediately - usually myself, Steve, or Jerry.
We final assemble all our Toro machines here in Commerce, CA - so we have stock of EVERY SINGLE PART IN THE MACHINE. Should you ever require ANY part, it is shipped the same day. We also have a 2-yr Warranty on all our equipment and I am not sure what John is offering.
I can assure you of this: If you maintain (a few drops of oil regularly, etc.) your Artisan machine will out live you.
In other words, it is an investment that will last you a lifetime. I have no idea what John is selling the Mach 1 for, but if you divide the price difference by the number of years the machine will be used (10? 20? 30?) - you will be able to make your decision a lot easier.