Has anyone use Rockbros Roof-Top Suction Bike Rack

Hi guys,

I have a question, has anyone here use the Rockbros Roof-Top Suction Bike Bicycle Car Rack Carrier before?

I have a friend who is using Sea Sucker and I think that product is very expensive.

I found a cheaper alternative which is the Rockbros Roof-Top Suction. But I don't know if its good.

Any advise and feedback?

Thanks