The things which put me off rotary are the fixed frequency combined with continuous power consumption, if you want variable speed you still have to add a drive, you can feed a drive with one or more transformers rather than rotary if you are going to use a drive.
I use dual voltage motors, retro-fitted where the original is not dual-voltage, and predominantly Siemens VFDs with the odd Hitachi or other major brand unit, if I ever do buy something which must have 415v I'll probably go the transformer(s)/industrial drive route as transformers are bullet proof and industrial drives are cheap second hand and NOS as most hobby users shop for 240v units,

- Nick