Review on VIAIR 400H Hardmount Compressor: Ultimate Power for Heavy-duty Applications by Kelvin Ward

Very fast for a compressor without a motor, but also prone to overheating/cutting out if running for more than 10 minutes at a time. However, this is a trade-off for the extra compressor speed with <100% duty cycle, so don't deduct a star for that. However, it will fill all my 35 x 12.50 r15 tires from 10psi to 25psi just before cutoff, so I'm happy. One star deducted for the unit arriving with a cracked top manifold. VIAIR customer service fixed the problem quickly and free of charge, but the QC should have figured it out before shipping.