first thing the mayay is a low end sound interface, so obviously you will have a much better quality response (superior to Torq or serato plastic boxes). We're still not talking vinyl quality but thius will be a huge improvement from your Maya.
in terms of the phono preamps. all you need to do is calibrate your MixVibes with the switches on phono. (You can still play your mp3 with the softare with the switches at phono level, MixVibes takes the switch in a account only ina bypas situation). As soon as you hit the bypass button on the skin you will switch to real phono sound. The phono pre amps are a decent quality, like something you would find in a mid-range mixer.
if you want to get soething close to vinyl quality, you'll need to pick up an RMP fireface 400. This is amazing gear, but quite pricey. the angain when you think about it. One RPM = the price of 80 records roughly. Well worth the investment for a sound afficionado or professional DJ