Self shut off & gauge is almost accurate and only off by 1 or 2 psi at the most. Only used it once but just from that one time I can tell this is 10x better quality than Slime. I removed one star because the carrying case is low quality and fits only the compressor.nothing else. I would gladly have paid another $5-10 for a quality case that's fits everything. That's a big deal to use truck and off road SUV owners.