Pot really depends on the platform your benching, but paying $10/liter is just getting ripped off. That's the highest I've ever heard of anyone paying for a liter. Glad to hear you're at a much lower price now
I've not touched the phase since I went LN2 and have no desire to mess with it. It's loud, hot and provides temps that are really only good for alleviating IMC strain for binning memory. For benching competitively it's useless.