Both very good points Al. If this upgrade is coming from ShopMaster, the chances are good that both the VFD's and motors are Chinese, and both these things should be investigated. Even if the parts are not coming from China, a manufacturer such as shopmaster doesn't always put the most expensive parts in the upgrades, or on the machines. Hard to make money that way and keep costs down. You may not be getting exactly what you want, or think you're getting.

TeaManMachine