We are running 2 supertrak machines and feel they are built very well. We have there takeuchi tl150 that they put high flow on, winch, big radiator and hyd cooler. We have put a bunch of hours on this machine. The other is a sk120 and it has around 5500 hrs on it. The CAT/ASV undercairrage is junk, it will nickel and dime. The cab is not great, but the performance is awesome on it.
I have nothing but good things to say about supertrak and there people...they have a really good service manager that has helped me figure out problems we have had....i have #2 sk120 so they have updated them a bunch since mine.
They are very pricey for what they are though!!!