Cant say I've use that exact unit, but there is enough commonality among the various re-brands that I would honestly recommend you do whatever you have to to get something at least one notch better.  The bleed valve is just a lame way to go.  Poor control and constant running of the motor will drive you nuts.  Pretty sure you cant (or at least shouldn't) retrofit the Sprint Jet with a regulator because it doesn't incorporate a pressure switch (the motor wont stop when you do and will wear itself out....unless you still use the bleed value...which defeats the purpose of trying to retrofit it).

For several years I had a Badger T&C identical to the Smart Jet Pro and loved it, but once you use a tanked model like the Power Jet it'll change your life....or at least your airbrushing.  I did a review a while back on the TC910 (very similar to the Power Jet).