I spent my time A-B-ing these two (BMT90 177/Vipecs and BMT94 186/Tectons) skis in spring slush/corn at the resort today. I also brought a pair of M-Free 108s, but they stayed in the car for the duration.
Attachment 413566
Findings? BMT94 deserves all the hype and then some. Absolutely great. If you can track down a second hand pair then you've found what is the best spring conditions ski I've been on. So much fun, yet skis like a more substantial ski than they ought to given their weighth. Mounted a +1. Tectons is what I had unmounted, so on they went. The 186s are a bit long for me at 175/68kg nekkid for touring, but their performance on the down might be worth the extra faff on the way up. Might try to get my hands of 176s too.
I love BMT90s too, but the 94s are just next level great. The 90s are bit more lively and gives you more of a pop out of turns. Surprisingly capable on firm snow and groomers. I thought they were as good a narrow touring ski as I could hope to get before getting on the 94s.
I prefer BMT90s to Mantra V Werks. I prefer the width of the MVWs for most conditions, but the 178s have this softer spot in the foreski/shovels that I am not sold on. BMT90s are more uniform in their flex. I keep getting the idea to pick up some new MVWs (would be my fifth pair if so), but I can't really see the need now.