I have a singer 20U33. It's a fine machine for lots of things. It's certainly more capable than domestic machines, and can sew probably any lightweight gear project you have in mind. There are some shortcomings compared to stright stitch industrial, like not being able to use all sorts of handy binders, folders, and tape attaching attachments that are available for those. There's also a bit less space between the needle and the body of the machine than with many plain machines. Zig Zag is handy, and it'll do button holes.
The Japanese made Singers are much nicer than the clones. I'm told by my sewing machine mechanic that the current production are junk.
Oh, one other thing: the built in spool holders won't hold an 8 or 16 oz industrial cone, you'd need to fit a separate stand for those, should you decide to use them.