Agree with mlmack. I just bought a 15-91 and it sews through denim like it's silk. Need not worry about what it can handle. But honestly, so many older, all-metal machines will do that. I just happen to also like the look of the 15-91. Look on Craigslist and when you see something you like, check for a youtube video of someone demo'ing it. I've learned a lot that way.