I'm looking to buy a new recovery unit and I'm stuck between two units. The RefTec MicroVac II or the Thermo-Flo 600. Has anyone had any problems with either unit ?? My Johnson Supply carries both but only stocks the Thermo-Flo unit for $697 and can order RefTec for $711. I'm leaning towards the Reftec, just because I've been told its easier to rebuild.