If it's a home machine, it's still going to have the problems that all home machines have: Not enough machine, inadequate bobbin capacities, wrong type of feeding mechanism, wrong size needles for leather work, etc.
That said, if it's a Pfaff industrial machine, then yes, they are good machines.....but parts are expensive for them.
I have a Viking (Husqvarnaa) home machine with a built in 'low gear', and even on a low setting with a roller type presser foot, the best it can do is about 4oz of veg-tan with me helping the itty bitty flywheel on seams. It'll do decently on chap leather, but since it won't handle the thread size I want, it looks rather awkward.
If you haven't read it, go to the sewing machine forum and read the article by Wizcrafts on what type of sewing machine you'll need.....and why.