Ultra Glide

With three days left until Fjällmaraton 100k, I received a pair of Salomon Ultra Glide. This shoe was just released and promises a lot more cushion than Salomon has been known for in the past. The big question now is if I dare to switch to these brand-new shoes for Saturday or if I should stick to my trusted Salomon S/Lab Ultra 2? If I had more time, I would go for a longer test run but that is not really an option since I urgently need to taper for Saturday...