Active radar reflector bands

[Falling Star]

I need a new radar reflector. Currently thinking about an active system. Should I get the old style x-band type or pay the extra and get the latest x and s band model? I guess dual band would be better, but is it worth the additional cost?

 

[Skysail]

If you buy X band only, then ships watching S Band only will not see you. I see no point in going for the old model.