I installed the Yamaha rack on my wrX this morning, so I did a nice long vibration test this afternoon over various road surfaces - 266 kms. An excellent bike day!
The jury is still out on the arse/seat interface - I'm just barely sore after the ride. Although maybe that's just due to Spring tender butt
(only 1614 kms so far this year!)
Next up I hope to get this:
http://www.giantloopmoto.com/collections/giant-loop-gear-collection/products/coyote-saddlebag
And hopefully in time for a 1,500 km May 21-24 weekend. Otherwise I'll just stick a kayak bag on the seat&rack.