I love how all these people who have never seen a Tajima Sai in person, much less used one are knocking it as a hobby machine. I mean, the first replier didn't even know what is was! So professional and helpful, guys!
I've been embroidering professionally for 20 years. I've used home machines at home and multi head machines in the shop. I got tired of being my own boss, and sold it all. I found I missed not having a machine, so I looked for a small machine and bought the Sai. I'm a professional, so instead of making judgements about a machine I've never seen, I went to my dealer and trialed his.
It was brand new on the market, and I bought one of the first ones. I've had it over 18 months now, and it still runs well. It is, in fact an entry level commercial machine, and nothing to be ashamed of if you're starting out. Not everyone has the financing to buy a multi head machine at first.
It has a metal frame and weighs 80 pounds, so it's not the lightweight that people are trying to make it out to be. I did have some issues at first because I had it on a lighter table, but moving it to a heavier table solved them. I've run it for several hours at a time, although I do run it at the 500 spm speed. It runs just fine on the 800 spm, but I'm sidework only these days, so I don't need the speed.
Also, anyone who is running their machine more than 10 hours a day needs to take a look at their life-work balance. Go home, see the family, have dinner and get some sleep!