I'm sorry if I came off as harsh on the other thread. Since you are new to sewing I was assuming you got the idea that the 15-91 was a good choice for what you want to do from the Ebay seller. So many of them tout domestic machines as being "industrial strength" capable of sewing leather, etc.. and it gets my hackles up. A 29 would be perfect for what you want to do as it's for uppers, not for soles. There are other leather industrials too but I'm only familiar with the 29. Like Janey said, most industrials aren't for leather, they're for garment weight fabrics, used in a factory setting. Research any industrial you find before you buy so you know what it was built for before you buy it. A lot of times the older ones can be found real cheap. The Yahoo group WeFixIt has a couple of industrial mechanics who are very knowledgeable about them.
Cari