Yakima Sweetroll Kayak Carrier Rack ???

Looking at purchasing a couple of the newer Yakima SweetRoll Kayak Racks to transport my two big and heavy Hobie Outbacks up to Tahoe area and back.  I would be mounting them on a square crossbar  truck ladder rack on my Ram 1500 truck.  I like the idea of the wheels on the back saddle - these are supposed to be an upgrade from the Yakima Hully-Roller setup.   I like the fact that I can use my Yakima SKS locks on the mounts too.

Anyone have any thoughts, experience or reviews on these?   Trying to avoid any buyers remorse.  Thanks!

Couple of links:
http://www.austinkayak.com/products/14919/Yakima-SweetRoll-Kayak-Carrier.html
http://www.amazon.com/Yakima-SweetRoll-Premium-Saddles-Integrated/dp/B00FUHDWAI

I have one that I use for my trident 13. Works great. Easy to put yaks on. The yak is really secure when tied down. I think it had a 75# weight "limit." Not sure If the outbacks exceed that.