I bought a Chinese TIG in around 2008. Paid £440 for it back then, still got it, its a pulse machine, I use it often but not a pro user by any means. I use 2.4mm tungsten in white, lanthanted for aluminium and red for steels (though you can use white I believe now for all).
I weld quite a lot with it of both ferrous and non ferrous. Its ok, sure there is better out there. Can make a hell of a mess with it if you are not careful. Welding radiators and intercoolers is very difficult. Mines a 200a machine and will make a weld nicely on 10mm as long as you pre-heat everything.
Made everything on my car with it.
Supply current matters, I can't use mine of full for very long, 1) you can feel the current being lost when you weld as everything gets warm, 2) the torch get so frickin hot you can't hold it for much longer than 20 mins.

I am more than sure a 3 phase machine will be so much cleaner and nice but, at home, I am more than happy. Mine is similar to the RD one linked above.