SW Motech crash bars are the only ones I'll use.

I'm onto my fourth set and well-and-truly tested the last 3. Even the Bumblewee has had a little lie down in the snow recently. A minor tumble can cause much more damage than a set of crash bars cost and they are cheaper than insurance excess.

They are well designed and tough.

• Constructed of heavy-duty mild steel
• Designed to provide maximum protection
• High-quality fit and finish
• All components are protected against corrosion by sandblasting and powder coating
• High-strength frame mounting points.
• Colour: Black 

Lower

• Tube Diameter: 22 and 28 mm / Wall Thickness: 2.5 mm

Upper

• Tube Diameter: 22 mm / Wall Thickness: 2.5 mm

The only downside I see is the extra weight, but I can live with that.

 Important: Upper Bars Mounting is only possible with SW-Motech lower crash bars.

Note: Lower set only.