The Rollei IR400 film flexes and moves a lot in the Combiplan tanks - It might work if you only load two sheets (one each side). The Jobo 25xx series tanks and reels are another option, but again, I wouldn't want to load them with six sheets at a time. With such a thin film base, any tank that supports the sheets by the edge is going to give problems. Like Ed, I found the Paterson Orbital works fine, but they are going for silly money on ebay...
Two alternatives spring to mind, both require short periods of total dark in the darkroom:
The BTZS tubes - Still in production ? If not, fairly easy to fabricate using off the shelf plumbing components.
A modified Premier paper safe (from Freestyle) in the style of the Paterson Orbital mods or with a slosher inserted.