Make sure your motor will work with the inverter first. I bought the 5HP SJ1100 for my Centroid conversion on my 325 Tree Journeyman, and it is really struggling with the 3 hp (sustained/5 hp for 15 minutes) 8000 RPM Yaskawa spindle motor.
If you've got a fairly conventional motor then the standard VFDs are probably good enough. But I've had to stretch the accel/decel times on the SJ1100 up into the 30 second range to stop it from faulting when going to or from full speed. I'm not sure it's making much power at either end of the speed range.
I'm going to be trying a borrowed 7.5hp VFD (and I do have three-phase into the VFD - it isn't doing any conversion) to see what that does, but I may have to go with a VFD that is designed to be a spindle drive, instead of a "universal" type of VFD. That won't be at all inexpensive if I have to do that.