I have an industrial machine that I use for general sewing (most of which is just straight-stitching anyway) and I love it. If you sew professionally, an industrial machine is a MUST.
I've had mine since 1986, and it's been in for repairs exactly once. That was because I got the needle stuck in a project and messed up the timing. It's an ancient 1930's era Singer, does only straight stitch, only forwards, but I can oil and clean it myself and you can do the math to figure out how much that has saved me!
Anyone who's shopping for an industrial, you need to find a store that specializes in industrial machines, so that you have a knowledgeable technician that can work with you to configure the machine and table to your projects and your height too. The table and pedal can be adjusted to fit you. There are various motors to run the machines, some are faster, some are quieter. The needles, throat plate, feed dogs, all can be customized according to your needs.
I liked my first machine so much that I searched eBay to find another like it, and located one in Toronto ON (two hours across the border from where I am in the US). The person who sold it to me has a shop that deals pretty much ONLY in industrial machines, and he is a third-generation sewing machine mechanic. He configured the machine, taught me how to time it, and taught me a few new tricks on using it.