i have a fat track and it's ok .
i use it to track my analogue synths and as summing box .
i prefer to turn all the knobs to max and lower the volume of the stems coming out from logic , so that i don't have to worry about settings when working on multiple projects .
the tubes are pre-master so you drive them with the channel knobs .
using an anylzer i noticed that it gives a lot of 20Hz
i found an interesting article to mod the fat track :
Opening up a TL Audio FAT TRACK to swap Tubes