Mafell's specialty lineup puts Festool's prices to shame. I briefly used a Mafell chain mortiser, and it was maybe slightly better in its function than the Festool/Protool chain mortiser. Both of those tools were similarly priced. However, with these track saws, they are in a league of their own. There is no competition to the 85E or 185E. If you need to make a portable tool cut of 3.5" thick, then it doesnt matter how much it costs. You need the 85E. Same can be said for the 185E, which is a 220v tool that is in its own league. Overall, they make some of the best and only tools in that class and therefore have an associated unique price.
I really havent had any issues or complaints against my TS75. I havent personally compared it against a Mafell, but i dont think it is a junk tool.