Ran into these for a lot of years mostly in plant aux equipment, their packaged gear drive, motor and VFD combinations are really pretty neat, biggest problem I found with them is getting thru their part numbers and all the options a unit could have. Their product support for many years was excellent, everyone I ever dealt with in their company was responsive and helpful, and most actually followed up to see if you problems got resolved. Even on older out of date units. Has been a few years since I have dealt with any of these, hopefully SEW still is really good at their customer service.
OP might be better off to contact them direct if he has specific issues.
MikeL.