I have both the KSOs and Komodo Sports, and I have a perspective for you since I also just finished a Tough Mudder (Colorado)
I ran the TM in my Komodos, and can tell you that little bit of traction on the bottoms went a long way on the uphill muddy portion. The sipes on the KSO's are awesome for wet pavement running, but just didn't do anything in the mud when i was training in them. If you were going to Run in KSOs I'd recomend the KSO Sport treks which have the more aggressive tread pattern.
with that said- I'd be very careful about running a Tough Mudder in Vibrams if you are still new to them. I have been training in mine for over a year, and I still had some issues keeping form in the downhills, and was pretty slow in what should have been the easier portion of the run.
I also fielded a lot of questions during the event- it seemed like every 3rd person I ran with was asking "so how are those Vibrams working out?" I also noticed a LOT of other competitors wearing them- most common were the Sport Treks, some Bikalas, and I DID see a pair of Speeds as I was registering which I wanted to ask about, but then didn't have the opportunity due to needing to get my race number written on my neck.
So my official review of Vibram Komodo Sports from my personal experience in Tough Mudder is the following...
swimming- Awesome (if swimming in 32 degree water can be called awesome- I think it was... LoL)
negotiating the man made obstacles- Awesome
Trail running- awesome
Downhill- NOT awesome- but I believe this was due to poor form, and that is my fault
When I trained I worked so hard on considering the distance and the obstacles that i didn't consider the terrain. This was really short sighted on my part, so train accordingly, and since you are running Tahoe- I'd practice downhill often.
I finished for sure- and I got a REALLY BITCHIN AVATAR out of it (check it out- nice right?) I wish you luck, and have as much fun as you can cause Tough Mudder was a BLAST for me!
I'm doing another one ASAP