Why don't you just buy a QPint of the color you use the most and try it out
The True-U is equivalent to the House Of Kolor you have been using.
http://www.tcpglobal.com/kustomshop/ksktu.aspx
There is also Ez-Flow. Which is equivalent to One Shot.
http://www.tcpglobal.com/kustomshop/kspstriplett.aspx
With an average price of 15 bucks per QP for True-U and 10 bucks for Ez-Flow, that's hardly an investment that will break the bank. From my own experience and what ive heard from others, im sure you wont be unhappy about your purchase.